Solved: Slow Transfer Speeds on Synology NAS

Solved: Slow Transfer Speeds on Synology NAS

So you’ve got a shiny new Synology NAS and you’ve started storing files on it, videos, music and so forth.  Unfortunately, the file transfer speeds are so bad you’re considering buying a turtle and glueing a USB drive to its back to speed up file copying.

After hours of searching the net for an answer, in the end, I found the cause of my woes in a couple of little settings tucked away on the Synology – effectively my Synology NAS wasn’t even trying to use newer/faster versions of the SMB protocol.

To find and check this, perform the following steps:

Login to the Synology NAS and click on Control Panel:

.

Ensure that the SMB service is enabled then click Advanced Settings:

In Advanced Settings, set the Maximum SMB protocol to SMB3, I also increased the minimum SMB protocol to SMB2.  If your NAS is operating on a private home network, you may want to disable transport encryption mode (use at your own risk) and enable opportunistic locking:

For me on my Synology DS215j, this took my file transfers from around 5MBps to around 80MBps!

For anyone looking for a better network platform for home, check out my article on Ubiquiti’s Unifi kit: http://bobmckay.com/i-t-support-networking/robust-powerful-home-wifi-ubiquiti-unifi/.

Bob McKay

About Bob McKay

Bob McKay works at Perfect Image, is a father, programmer and a self confessed techie-geek type.

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110 comments on «Solved: Slow Transfer Speeds on Synology NAS»

  1. Margaret says:

    Is it necessary to reboot after making the changes? I have the DS218j. First I had used Disk Station to do a 2-way sync on my desktop for the Pictures folder. SLOW. Next I synced the Music folder. Relatively faster. Now I am attempting to sync the Music folder on my tablet (SSD) remembering how much quicker the transfer was on the desktop. File transfer rate = 1 file every 8 minutes. It’s been several days and 473 files remain. This is beyond painful. Many other descriptive words. So in short, I’d like to try these changes now w/o having to start all over because of a required reboot. Thank you!

    1. S400 says:

      Tried this change to SBM settings myself – on a DS918+.
      It has made absolutely no difference whatsoever – even though the LAN connection on the NAS swears it is connected at 1000Mbpds , full duplex with MTU = 1500.
      MTU size is the same on the PC..

  2. Margaret says:

    Got my answer. When attempting the change, “Network Service will restart”. Guess I need to be patient….

    1. Micheal Espinola says:

      For anyone wondering, you can do this live. Your time machine backup or file transfers will quietly recover from the extremely brief disconnect. Networking at this level recovers all on its own. You’ll quickly see your time machine backup estimated time drop soon afterward.

      1. Stephen says:

        Yeah – wow!
        I was doing an rysnc at 7.56MB/s. As soon as I hit apply (well, at least I didn’t notice anything pause), it jumped to 63MB/s!

        The strange thing is, before I expanded my volume from 1 disk to 3 I was getting 30-40 MB/s

        1. Stephen says:

          Scratch that – the network disruption unmounted the share and Ubuntu wrote to the root disk.
          Turns out my network cable clip is broken, and somehow dislodged just enough to go to 100Mbit. At 1000Mbit, I’m getting 17 MB/s – still rather useless really compared to the single disk speed.
          Internal file copying was 40MB/s and a Mac client was about 50MB/s, so it’s just something that Ubuntu got upset about…

          (I’m up to 32MB/s with normal file copying instead of rsync…)

          1. Remi says:

            I’ve been fighting with this issue for weeks… broken network cable clip was the culprit! hahahahahaha *barf*

          2. Bob McKay says:

            LOL – I feel your pain. I once had a customer network that had an intermittent fault but the switch wasn’t smart enough to diagnose where the problem lay. In the end it was a faulty NIC on the laptop of a travelling/roaming user.

  3. Will says:

    Thanks! Just wanted to comment for others that might stumble upon this. Don’t have a gigabit router so was looking for other options to speed up my 1.5mb/s speed. This really worked – cut a 90gb move from 16 hours to 3 hours.

    1. Bob McKay says:

      Hi Will,
      Glad it helped! 🙂

  4. Matt says:

    I was really hoping that would be the answer to my problem… unfortunately it didn’t do the trick 🙁
    However, my settings wasn’t setup as you prescribe. So I hope that a step in the right direction.
    Thanks for that.

  5. Giordano Bruno says:

    Good morning. Your hint made my month!
    Slow speed has been a problem for years for the 1812+: the max. was 25 at its best …
    I was even considering changing it for a newer model.
    Now speed is up to 110 which is perfect.
    Again: Thank you very much and all the best for you and your family.

    Giordano Bruno

    PS What is the transport encryption mode? What if I unable it?

    1. Bob McKay says:

      Hi Giordano, I’m glad it helped! The transport encryption mode adds encryption to SMB V3.0 for security but obviously like any encryption, it comes at a cost so may affect your top speed it its enabled (try it and see!).

  6. Ming says:

    Very helpful. Save my day. Almost return. Synology should put this on their site

  7. Cub says:

    The hints not work for me, still only getting 10.5MBs max transfer,
    Any advise?

  8. Clay Burch says:

    I can’t even access my nas. It keep saying authorisation required. Any suggestions???

    1. Bob McKay says:

      Hi Clay,
      I’m afraid if you’ve lost the credentials to your NAS you have a whole other problem my friend!
      If you can browse to network shares though, your computer must have some saved credentials you may be able to retrieve.
      Bob

    2. GC says:

      Clay, There is a reset button on the NAS. Use it VERY CAREFULLY. The Synology web site will say something like hold BRIEFLY and it will reset the password. If you hold it too long it will do a complete reset and you will lose your data. So please, READ the web site first.

      1. Bob McKay says:

        Hey GC, Thanks for the useful comment!

  9. Sanjay says:

    How long do I have to wait for the \\Diskstation share to come back? Currently says “The Network path was not found”…

    1. Bob says:

      Reboot the PC after the change. I had the same issue and that resolved it for me.

  10. Craig says:

    You legend!!!! Cant believe Synology don’t advise this info!

  11. Adam says:

    I recently purchased and installed a Synology DS418play NAS, using WD 4TB RED drives. After finding Mr McKay’s page on the interwebs,I made the same changes to my NAS as listed above.

    Yet, it hasn’t solved the speed transfer issues. When moving three (3) ~4GB files from a PC to the NAS, with the NAS mapped as a network drive, the initial transfer speed is great…some 106mb/sec (Ihave the two NICs bonded, on a gigabit switch). Then, within a few minutes, the transfer rate falls off a cliff, dropping down to 5-6MB/sec.

    It appears to be an issue during a multiple file transfer, not a single file transfer.

    1. Bob McKay says:

      Hi Adam,

      When you say the issue seems to be when you’re transferring multiple files, are they concurrent or queued? I’m wondering if concurrent copies of large files will have the hard drive head dancing back and forth and it could be the slow down you’re seeing is the caches maxing out. What is your RAID configuration and do you see the same problems copying the same 3 files back to your PC *from* the NAS?

      1. EB says:

        Honestly, I want to throttle the people who suggested I buy a NAS and the replacement supposedly ‘better and faster one’. What a waste of money. I’ve spent the last 5 days trying to upload, transfer and get everything running and syncing smoothly!

        1. Bob McKay says:

          Erm … thanks for the comment Em.

        2. steve says:

          call me 🙂

  12. MB says:

    Hi, thank you very much, I’ve been seaching on the web for couple of hours before finding your solution. It works for me!
    MB

  13. Brandon says:

    Recently installed a DS218, and the upload speed is awful. I made the changes above and I’m still getting upload speed in the single digit KBs range. At this rate, it will take a century or more to transfer my terabytes of photos. Do you have any other suggestions?

    1. Bob McKay says:

      Hi Brandon, what have you tried and what is our setup? (e.g. Mac, PC, Wired, Wireless)

      1. Brandon says:

        Hi Bob, thanks for your response. The DS218 has a wired connection to my Netgear R7000 router. All of my computers are running Win 10. One desktop is also has a wired connection, but the computer where I store the majority of my data is connected via wi-fi (2.4GHz). So far, I’ve tried changing the settings specified above and rebooting. Upon rebooting, the upload speed jumped up to 175Kb/s…very briefly, alas. It then returned to <10Kb/s…

        Could it be the CAT5 cable I'm using?

        1. Bob McKay says:

          Hi Brandon,
          I doubt very much that the problem lies with the cable between the Netgear and the Synology but given both have Gigabit ports its probably worth putting a CAT6 cable in there anyway (negligible cost too). The speeds your seeing are so slow however that something else is amiss here and I’m guessing the issue is around the wifi. Have you done a test transfer from the PC that is connected to the Netgear via a cable? This should prove (or disprove) that the connection from the Netgear to the Synology is sound. What signal strength is your computer seeing? If you do a browser based broadband speed test on that computer, what speeds do you see? (I ask because that should theoretically show you the slowest speed on the whole chain which given the speeds above appears to be within your home network).

          1. Brandon says:

            Hi Bob,
            I was playing with it again last night and this may be a case of user error. I discovered the upload queue and got better visibility on what what happening. I did what you suggested about moving a single file (2GB) from the wired computer to the NAS, and it transferred in about 2 minutes. I tried the same file from wifi and got a similar result. I’m now moving the folders in smaller pieces (40-50GB at a time). Upload speeds bounce around between 1-5 MB/s…is this normal?

          2. Bob McKay says:

            Hi Brandon,

            There’s still a lot of factors to consider I’m afraid but the critical one is that MBps is not the same as Mbps (its all in the case), a MegaBYTE is eight times larger than a Megabit. If you are using, for example, the Wireless-G (since you said your wifi 2.4Ghz) then the theoretical link speed is 54Mbps (Megabits) now in reality this equates to a 25Mbps transfer rate. To measure this in MegaBYTES you need to divide it by 8 so we’re talking around 3MBps.

            The truth is, if you want to do heavy lifting in terms of file transfer you either need a cable or a dual band wifi. Personally I swear by Ubiquiti Wireless Access Points, the pro versions of which give me a real-world transfer speed of around 25 MegaBYTES per second.

        2. Neal says:

          I had the same problem with the DS218+, I was transferring a ~100 GB folder with lots of tiny PDFs and it was running at around 10 to 50 Kbps. The way I solved it was to zip up the whole folder and transfer it at once, which reduces the size slightly but I think the major gain is that there must be some overhead in opening and closing a transfer connection in the Synology software. Once, the transfer was finished I extracted the ZIP file on the drive. It’s not ideal but gets the job done.

          1. Bob McKay says:

            Hi Neal,

            I think this is really a general issue not just Synology, I used to see this all the time when copying websites across servers, etc. (as they tend to hundreds/thousands of tiny files), just zipping it use to drastically reduce the time on both Linux or Windows systems.

  14. Brandon says:

    Hi Bob,
    Thanks for the advice and information. Continued testing over the weekend, looks like it’s working well. I switched the wifi to 5Ghz (802.11ac according to the router manual) and uploads are generally 5-10 MBps (not Mbps) according to the upload queue. The key is to not try moving terabytes in one chunk, I think. I moved a couple folders >150GB and upload times were in the 12-24 hr range. Anyway, thanks again!

    1. Bob McKay says:

      Hey Brandon,
      I’m glad things seem to have sped up. One thing I hadn’t considered is that when copying multiple files from my PC I never do ‘concurrent’ copies, that is where you set a file copying, then separately set another copying, then another, etc. – this is because Windows isn’t smart enough to just push each additional file to a queue, it copies a chunk of each in a cycle, which means there’s a bigger admin overhead (and if you have an old HD, the read head will be jumping about a lot more). If you need to copy multiple files, I’d only do it where you are able to select them all at the same time and do a copy/paste (sometimes I’ll even move files on my PC to the same folder before moving them to my NAS to facilitate this).
      All the best
      Bob

  15. johnrxx99 says:

    It worked for me. But why did it need to be changed – I was at 112 Mbps then dropped to 12Mbps for no apparent reason.

  16. Roger says:

    Thanks a lot, it brought me from 10 to 110 MB/s – been waiting so long to copy the files for a year until I googled and found this forum 😀

  17. andy says:

    hi bob my ds215j wit 2x10tb hdd in shr buut when i try and copy my 1Tb acronis system back up to usb hardrive im luck get 6MB/s which is slow when this drive does 80MB/s plus on my usb3 on pc. Your fix did not speed it up dsm 6.2… fully up to date

    1. Bob McKay says:

      Hi Andy,

      Thanks, just to be sure, are you copying over USB, wifi or ethernet? Samba (SMB) is a network protocol you see.

  18. Martin says:

    You, my good sir ROCK!
    Been uploading photos for days. Now I’m done in a matter of hours.
    Thanks a bunch and cheers

    1. Dan says:

      Hi Bob, I come.across your page when I am searching for a solution to the slow transfer. I have just got my DS918 and setting it up. Tried transfer a drama download and speed was like 3MBps. I did as what you have shown. But it hasn’t turn for the better. Do I need to do a power down reboot for my DS918..? Many thanks…

  19. Graham says:

    Thanks for this, new NAS and couldn’t understand why it was so slow on transfer. Applied your settings and rebooted, all is good. Thank you sir!

  20. Robert says:

    Hi,
    Great post. I was getting 4MB/s upload to the NAS drive from my laptop on wireless.
    Adjusted all parameters as listed above and that still didn’t work.
    Finally changed wireless to 5G and that made it jump to 10 MB/s for smaller files and 40MB/s for larger video files.
    I am sure more fine tuning to be done but it’s very usable now.

    Thanks,
    Robert

  21. RetroC says:

    Hi,
    Tried the settings suggested above but unfortunately did not have change anything for me.
    I have a DS218+ wired to router. Used to access it via powerline (650 Mbps) from my PC and got around 110 MB/sec.
    “Upgraded” my WiFi and now use Asus wifi card (Triband) to connect to TP-link Archer VR2800 router. Windows suggests the WiFi connection speed is 1700 Mbps which I was hoping would give me similar results to powerline. My current file transfer speeds are 5-8 MB/sec which is slower than my broadband. I think its a settings issue as file transfer between my Laptop and PC over WiFi are around 30 MB/sec. I have tried to switch from SMB to FTP but no change in speeds. Is there something I am missing. Any suggestion will be appreciated.
    Thanks.

    1. Bob McKay says:

      Hey,
      I’d try the Powerline again (with the far end plugged in to the new Archer router), the idea being to to test the throughput from the Archer to the NAS (if its as fast as it used to be, you know its a problem with your wireless connection rather than that link or a protocol issue. Assuming that the test shows fast speeds via the Powerline, I’d try a couple of different options for connecting via wifi if you can (diff adapter, tablet, mobile, etc.) and see what throughput you get. All I can think of I’m afraid!

  22. SyVo says:

    Thank you! It work great.

  23. Trueqap says:

    :)) Thank you!

    from 40 to 780 MB/s with 5g WIFI!

  24. Alex says:

    I recently bought the 918+. I have it and my previous Synology connected at the same gigabit ethernet switch (older version of TP-Link’s TL-SG1005D), however even after adjusting the Network settings on both Synology DSs, the transfer rate is still around 3 MB/s. Nothing has changed. How can I doctor this (I have no problem exchanging parts of the hardware) to finally get solid transfer rates between them?

    1. Bob McKay says:

      Hi Alex,
      Too many unknown factors here to be able to offer any advice I’m afraid:
      Where to/from are you doing the copies? (device types, etc)
      What type of connections are the devices using (I’m assuming the Synology units are wired but if using a PC, is that on wifi?).
      Have you checked resource monitor to see what speeds the Synology units say they are connected at? (if you have a bad cable, it could still be negotiating to 100Mbps even if both sides are capable of Gigabit).

  25. Carlos says:

    Hi Bob, I followed your recommendation but the issue persisted and my write/reads were still slow on a Macbook.

    However, switching from afp://…. to smb://… seems to have done the trick; speeds jumped from 5MB/s to around 100MB/s.

    Sharing just in case someone else forgets that this trick is for smb. Like I did!

  26. Jose Mercado says:

    For those still having the issue, as it does not apply to your setup. If you have dedicated 10GB connection to your NAS, make sure your iSCSI Targets are set to bind to those network cards. If all Networks are selected, you will notice that speeds will not always work as expected as it would be binding the connection to the slower Network card interface.

    go to your iSCSI manager, select the target section, select your Target and Edit. In there Select the Network Binding tab and use the “only selected interfaces” and check only the desired high-speed interfaces on the list. Bingo! now you have the expected speeds. Synology has a fantastic write up on MPIO (multipath) as well that is easy to follow.

    The above answer asumes you have properly configured the network interfaces on your server and NAS.

    1. Bob McKay says:

      If that’s your home-setup I have serious geek-envy!! 🙂

  27. JP says:

    You ar a legend. Went from around 20 up to 120! So a quick courtesy to say thank you.

  28. pickles says:

    I had already put the SMB3 & 2 min & max, but hadn’t disabled Transport Encryption Mode and now i’m uploading over wifi at 15 MB/s and have uploaded 2 gig in a few minutes, which took an hour before. So Thanks!

    The only thing i’m not sure about is I still have the ‘Enable SMB2 Lease’ ticked, as when I went to untick it, it warned “If you disable SMB durable handles or SMB2 lease, the Bonjour Time Machine broadcast via SMB will be disabled”. Which sounded bad as this is a Time Machine backup i’m doing so I left it ticked for the time being. Will that make much difference? Oh, i’m on Mac.

    1. Bob McKay says:

      Hey Pickles, glad this helped. Regarding the Time Machine Broadcast I’m afraid I’m not an Apple guy so can’t help, hopefully someone else here may know.

  29. Paul says:

    I want to use my Synology DS718+ to backup 2 Win 7 PC’s, one with an Ethernet link (PC-1) the other wireless (PC-2). Each PC has an external USB drive and a NAS user folder mapped as a PC drive. I can’t do unattended late night automated backups since the NAS maps disconnect after some idle period. I did a backup on PC-1 to it’s external USB drive and copied the 110GB file to the NAS drive at a good rate in about 45 min. That won’t work for PC-2 since the wireless transfer rate is far too slow. I’m thinking about adding a PowrLine Ethernet link from my Router to PC-2 (no easy way to run a cable) and would appreciate any thoughts on this.
    I also have 3 more PC’s I want to connect and am thinking of adding an 8 port Ethernet switch but not sure if I can still set fixed IP’s for each user.

    1. Bob McKay says:

      Hi Paul,

      This really depends on the type of backup you’re doing, these days I generally ‘image’ my PCs shortly after a clean installation and manually copy the image to the NAS. After that, just backup documents, etc. to the NAS directly on a schedule. You should need to map network drives, just create a shared folder on the Synology and use the UNC path to it (\\NASNAME\SHAREName\) – provided your machines are using your local router for DNS, this should work fine. In terms of fixed IP addresses, again you should really need them – just use the UNC paths of the PCs (e.g. \\PC1\). I’ve used powerline adapters quite a bit as my previous apartments were solid concrete & rebar, they worked pretty well and from what I read, they have gotten a LOT faster since then. Just remember that the sockets generally need to be on the same phase and sometimes you can get interference from other equiment (I used to have a cheap laptop power adapter that would kill powerline connections when it was plugged in to the same ring main).

  30. jp says:

    these settings did nothing for me. Still in the sub 10 b/s, transferring 1GB takes almost an hour.

    1. Bob McKay says:

      Hi JP,
      This seems like something else is going on there, without any details its impossible to help however. For example is it wired or wireless, what is the theoretical speed of the connection, what operating system are you running and what is the data your copying (e.g. 1 1GB file or 1000 1MB files)

  31. Smithers says:

    Nice info! I have a DS216SE and since a week or 3 transfer files is so slooooow. It start 2 sec with 30mb and then drops to 1mb and 366kb and 0, back to 1/2mb and 366kb and 0…..after checking i’m seeying my diskspaces runs up to 100% and i think that is the bottleneck. I have 2 reolink camera’s attached but i disabled them testing and no difference. I tried your stuff above but nothing seems working….any suggestions? thanks in advance!

  32. Rxs says:

    hi.. this seems to be a productive thread,,
    I’ve searched high and low for the issue i have!
    I’ve got the Synology DS418Play with four 2TB Seagate Ironwolf NAS drives. even with a direct wired connection to the NAS, I am unable to get more than 10mb transfer speeds. Its rather sad! I’ve been at this for at least 6 months now to no avail!
    any help will be really appreciated

  33. Rockit99 says:

    Well that did it for me and I thought I’d set the USB to ‘3’ already!

    Thanks for the tip!

  34. Bjorn says:

    NOTE!!
    I also had data transfer problems. Alle Cat6 cable, gigbit switches. Everything checked with testers, I was going crazy.

    Eventually a pro network friend of mine asked: do you have a Sitecom switch in your network? Yes I had one, after replacing it with a proper switch all is extremely stable at 115MB/s.

    Do you have a Sitecom switch? Do the following:
    Disconnect all cabels, place it on the floor with a bit of room around it, then smash it intensively with your foot until only tiny pieces are left, THAT’s my recommendation for Sitecom hardware!

  35. Homer says:

    The instruction above didn’t help. Finally solved for it with these settings:

    Under File Services -> SMB/AFP/NFS
    Max SMB – SMB3
    Min SMB – SMB2
    Encryption – Auto
    Enable opportunistic locking

    Under File Services -> Advanced
    Enable file fast clone
    Enable Windows network discovery to allow file access via SMB

    On Windows 10, turn off SMB 1.0 and turn on SMB Direct

    Hope this helps. Good luck

  36. mulder says:

    No luck on a DS918+ write performance on gigabit LAN between a PC with an SSD can only push files to this NAS in RAID 10 at 20MB/s and read at 50MB/s? I have RAID1 IOMEGA NAS’s from 15 years ago that are faster. SMH. SAD.

    1. Kurt C says:

      same here. changed settings. but problem remains… DS218j

  37. Federico says:

    Thank you! The transfers for DS Photo (Android) are much much faster than before 😀

  38. Tom Mensink says:

    I applied all these settings on both NAS and Windows 10 PC and regretfully this all doesn’t work for me. Not with wifi and neither with direct USB cable.

    However the zip solution works: 250 MB of files in a folder which would take 11 hours with about 50 bits/second, is now copied as .zip file in a few seconds to the NAS!!

    Would still be nice though to get a speed on multiple single files which is about 100.000 times faster. Something must be terribly wrong.

    1. Bob McKay says:

      Hi Tom,

      The speed your seeing above is unfortunately not down to the connection speed of the Synology but purely the admin overhead at source and destination for moving lots of small files. This occurs even on a business network when copying to a high-end Windows server. I used to run a web design company and websites, by definition, are made up of thousands of small files – we used to see the same problem you’re seeing all the time.

    2. Manni says:

      Hello Tom Mensink,

      did you find a solution? I face the same problem.

      I have also very small transfer rates on small files. Also as you, the time needed to copy many small files has a multiplication by a big factor compared to big files. The NAS itself on USB copy and everything else is very fast, also on small files.
      But transfer rates drop high on WLAN even on really, really great WLAN conditions. Transfer rates also only have a high drop on small files, not on big files. Same as you.Big files are transfered great.

      Zipping file is not working in every case. For example using DSM as SVN Server or as Cloud-Synchronization, you want to have also fast transfer rates on small files.

      Do you have a tip?
      Or anyone else who has this problems?

      I tried several settings and googled very much! But no solution. The high drop in transfer rate is only on small files on WLAN (also on 5Ghz with very good condition).

      I tried several DSM Settings, I switched of IP v6, I tried Windows tweaks. But it is still slow on small file over WLAN. As Example, slow is under 100 kbit/sec (30-50 kbit) for small files vs. 80 Mbit/sec on big files. So the difference is very high.

      Copying same small files out of USB to DSM is fast. Copying same small files out LAN to DSM is also relatively fast. Not fast as USB copy or copy on DSM itself, but still at around 5-10 times faster as WLAN.

      I hope someone has a tip.
      E.g. I want to speed up SVN on very big bunch of small files to DSM.

      best regards
      Manni

      1. Manni says:

        As side note:

        Also the calculating time for deleting a big bunch of small files is incredibly slow over WLAN on DSM.
        On local DSM or local Windows it deletes the files in a blink, it is so fast, that you do not see any popup. And when deleting the same files on DSM over WLAN, you need 20 seconds. Also here, a very, very high factor of needing more time for the same task.

        Thanks a lot for any help!

  39. Nick says:

    I have tried to apply the instruction above on DS918+. Write performance still the same at 5mbps max 🙁

    Is it a must to connect with ethernet cable to transfer file in order to get a faster speed? Or the instructions above can also increase the transfer speed via wifi as most of the members with me are using wifi to read/write file to the NAS.

    Any help would be greatly appreciated.

  40. GaryB says:

    This worked for me.
    I started seeing speeds up the 100Mbs after making the change.

    The other thing I did was copy to the NAS directly through the computer folder on the network, not through the media server. Most certainly do not transfer using quickConnect.to/User. Its really slow.

    Sonos Problem.
    I found that after transferring all my music files to my new NAS the sonos failed to sync.
    Seems that Sonos uses SMB1. I had to reset the minimum back to SMB1 .

  41. Stacy says:

    Thanks for this. May have also greatly improved my CloudSync to DropBox syncing.

  42. Dexter says:

    For anyone that still has this issue, keep the above synology settings:
    Maximum SMB protocol = SMB3
    Minimum SMB protocl = SMB2
    Transport encryption Mode = disable (I suggest leaving this at auto, encryption DOES impact speed no matter what OS client you use)
    Enable opportunistic locking = Enable

    What I found out with a Windows 10 O/S:
    Configure the network adapter (I did this with a WIRED connection) -> Advanced settings -> WINS ->NetBIOS setting. ENABLE NetBIOS over TCP/IP.

    That above setting kicked my Synology DS413J from a dismal 8-10MBps to an average 30 – 55MBps. And yes, speeds go quicker if you configure the synology file service to disable encryption.

    1. Bob McKay says:

      Hi Dexter,
      Thanks for this – out of curiosity what Synology model do you have? I’d also be curious to know your setup generally as I’m very surprised that a legacy protocol like NetBIOS would impact your transfer speeds.
      Appreciate the detailed instructions if this is able to help others though!
      Bob

  43. Nathaniel says:

    This is a productive discussion; thanks to all the contributors.

    Changing the settings did not work for me and I’m getting ~5MB/s with an rsync transfer of a lot of photographs ranging from about 10MB to 50MB in size (hundreds at a time).

    I have a Macbook Air connected to a Time Capsule router (gigabit) through a USB / Ethernet adapter. The USB should be capable of 5Gb/s so I don’t think it is throttling the ethernet (Cat5e cable). DS218+ is connected to Time Capsule as well (Cat5e).

    I would appreciate suggestions!

  44. Julia says:

    Hi all, I have a DS218+ and I’m struggling to upload folders.
    I have my Mac wired to the router. If I do a speedtest on my computer it says 605Mbps DL and 107Mbps UL. When I transfer the files over Synology Drive drag and drop, but also on Finder, is super slow. The speed shown on Synology Drive is 2MB/s.
    I set evrything up as described above, but still very slow, is there anything else I can do?
    Is this transfer speed normal for the internet connection I have?
    Thank you so much for your support

    1. Bob McKay says:

      Hi Julia,
      Lots of unknowns here so a few questions:
      You did a speed test, presumably that is of your network connection not your internet connection? (dam fast if its the latter)
      You ask if the speed is normal for the internet connection you have – I’m assuming the Synology and your MAC are both on your network so the internet speeds shouldn’t play a part.
      What sort of files are you copying?
      My best guess here is that the appropriate protocols aren’t enabled, this guide here shows the settings for AFP, etc. when setting up Time Machine for Mac backing up to a Synology NAS, I’d check out section 1.3 of this guide:
      https://www.synology.com/en-us/knowledgebase/DSM/tutorial/Backup/How_to_back_up_files_from_Mac_to_Synology_NAS_with_Time_Machine#b_15
      Hope that helps.

  45. Dani says:

    Hey all! Super helpful thread. I’ve enabled the SMB services and the upload speed has increased dramatically.
    But In my DS218j when using Synology Drive 2.0 from an external location if I try to download a file the upload / download speed is super slow (>1mb). But from the same external location if I access to the DMS vía DDNS (https://xxxxxxxx.synology.me:5001) and I try to download some files from File Station i am getting 20mb/s speeds, something more reasonable. Maybe Synology Drive cannot use the 5001 port and is accesing to the NAS via QuickConnect? Makes sense? How do you do to increase the speed of Synology Drive?

    Thanks in advance!

  46. Patrick says:

    Wow, I’ve read the whole thread here, but nobody seems to get the issue I have. People seems to have speeds issues. I’m in the process of transferring data from my old NAS (Netgear 4 Ultra NAS – RAID 5 – 4 x WD Red 3 Tb) to my new one (Synology DS1817 – SHR-2 4 x 6Tb WD Red). So I’m transferring data over network which is all Gigabit network, and I reach about 420Mbps, I’m pleased with that.

    The issue I’m facing it that about 20-30 after starting a transfer, which is made either from Windows Explorer, Directory Opus built-in transfer dialog or even bvbackup 2, a small but useful backup utility, it starts to be really slow. If I reboot the Synology NAS, it goes fast again, that’s why I think it’s the issue here. But as the transfer foes on, the delay between files transfer (each of them are between 1Gb and 5Gb) becomes more and more important, then, after 20-30 minutes, you can count about 2 minutes between each file transfer, and finally, after 30-40 minutes, the network link on the NAS goes down, the shares drop, I have to reboot the Synology NAS to get it working again.

    Besides that, everything is fine, but it’s like if I ‘hammer’ the NAS by transferring a lot of files into it, it seems to become overwhelmed and the it drops ethernet connections all of sudden.

  47. Albert says:

    Thank you!! It was just sitting there timing out; and now I’m at max speed.

  48. Bobby says:

    Thanks. If my read speed is consistently over 110MB/s but the write speed is stuck on 84-86MB/s what could cause that?

    I tried the above and most of the suggestions in the comments.

    1. Bob McKay says:

      Hi Bobby,
      Writing has a higher admin overhead that reading (due to writing the data, file allocation tables, permissions, etc.) so I would assume this is the cause – still decent speeds to my mind.

      1. Bobby says:

        Thanks for your response. I should have noted that my write speeds would start around 110 and settle around 94-101MB/s.

        Nothing has changed with my network. It’s just a bit of a pain with transferring large files now with the decreased speed.

        Thanks

  49. jeroen says:

    thanks for the exellent info,
    i was frustrated, uploading files to my nas was at 3 kps !!!!! (with a wired lan connection),
    i followed your tips and at first i reached 4mbps which was an extreme improvement, but after a minute everything dropped back to 5 kps

    i was doing everything with quickconnect and this seemed to be the mayor problem,
    from now on i only upload using windows explorer, i have upload speeds of 8MBs to 16 MBs,
    maybe not what its supposed to be but now at least i can do something

  50. WHW says:

    Found this thread while googling the issue.
    Same thing on mine (DS218PLAY). Suddenly I couldn’t get any transfer speeds above 2 – 2,5 MB/sec.

    I was connected through QuickConnect. None of the solutions in this thread seemed to fix it for me, but if I used Explorer and simply navigated to the share, speeds were back to where they were supposed to be.

  51. a7u4 says:

    Worked on DS414j. Thank you

  52. F says:

    Hi experts, I turn to you with these requests. I bought a Synology DS218j NAS server and a Seagate BarraCuda 4TB disk into it. I managed to install everything, get it working, but I copied the files slowly.
    I connect to him so I created a network unit in the pc with his address: 192.168.0.185 and saved the login data. While downloading from it is always about 100 but when writing it is copying 3GB file slowly 10-40 all the time from the same location and when copying 20 and larger file speed is between 114-88. And that’s strange to me. I have no switch to test it with. But when copying from PC 1 to PC 2, the speed is fine around 105 and no matter how big the file is. It’s the same whether I copy from PC1 or PC2.
    When I connected the NAS directly to the PC so nothing changed, just the IP address of the NAS and I had to create a new network unit but that’s understandable. If I have to change and re-set the network adapter on the PC and NAS IP so I do not understand and I did not. I have Samba 1 turned off in windows 10 and set as minimum SMB2 and max SMB3 in NAS. Encryption is on the car, renting SMB2 does not change its on or off. Opportunistic Locking is on, WS-Discovery is also on. I don’t know what to do anymore, so please ask for advice.
    Thank you.

  53. Dan says:

    Omg thank You very much. I am now on 80 MB/s from max 25 MB/s

  54. Jason says:

    HI,
    I have been experiencing the same problems as many posters here.
    I have slow transfer speed between my DS218+ and 2016 Macbook.
    I have tried all the suggested fixes with no success.

    Wifi Network here has 2 Ubiquiti AP running at 5Ghz connected to Edge routerX through a Netgear switch. All ports indicate a 1G ethernet connection. Laptop Wifi Connection speed ranges from 400mbps to 200mbps.
    Doesn’t seem to matter where I am in the house, Black Magic reports about 22MB/s read and write.

    I’m lost now. Don’t know what to do next. I have SMB as the only protocol on the DS218+
    Max SMB – SMB3
    Min SMB – SMB2
    Transport Encryption – DISABLED
    Opportunistic Locking – Enabled

    The NAS is configured in Hybrid Raid mode (SHR) running 2 WD Red drives (4tb) which are reported as being healthy and only approx 12 months old.

    I’d really appreciate anyones help as I’m about to go nuts. I’ve spend weeks trying to fix this.
    There maybe a nearly new DS218+ on Ebay soon.

    Thanks in advance for any ideas….

    1. Bob McKay says:

      Hi Jason,
      This actually looks about right to be honest. Wifi rarely delivers even close to the listed link speed in terms of throughput (to quote this article: “In addition, net IP layer throughput of WiFi is typically 60% of the air link rate due to WiFi being half-duplex”). Obviously you then need to divide by 8 to get the Bytes per second rather than bits so in your case if we call the average speed 300mbps, 60% of that is 180mbps, divide this by 8 to get the bytes per second gives you 22.5 MBps (note bytes rather than bits).
      The true test of where the bottle neck lies though is to do a speed test with a wired connection.

  55. Jason says:

    Hey Bob. I finally got around to testing a wired connection and was seeing between 90-100MB/s for both read and write. After re-reading your previous comments, I am thinking that wifi and wired connections may be performing as expected?

    I’d really appreciate your thoughts and comments. Thanks acne.
    Jason

  56. jason says:

    Thanks acne (?) *again* !

    1. Bob McKay says:

      Hey Jason,
      You’re welcome! Autocorrect strikes again huh!? 🙂
      All the best
      Bob

  57. Jose A. Eiroa says:

    Hi,, it doesn´t work for me.. just 10Mbps..
    Nas conected to router with cat6 wire..Router conected to PLC with cat6 wire..and Pc conected to PLC (3m far from main PLC) with cat6 wire.. I know conected through PLC decreases speed, but … it´s just 10Mbps..
    I think the problem is inside synology ds218.. in network status 100Mbps, full duplex, mtu 1492. Is it right?.. It should be 1Gbps, right?..
    Thanks

    1. Bob McKay says:

      Hi Jose,

      I’d be very surprised if the bottleneck is the NAS, I would guess the PLC (I’ve assumed you mean PowerLine Convertor/Connector). While PowerLine connectors are good, they can get interfernce from lots of sources. A common problem I have seen is from AC/DC adapters (for example laptop chargers, phone chargers), generating ‘noise’. Things I’d try:
      – Plug in directly to the NAS via an ethernet cable and test the speed, if this works you know the problem is the PLC
      – Trying switching off anything not needed and do another test with the PLC, if its faster, slowly turn things on until you find what is generating the interference.

      To be honest, if your PC is only 3 meters from your router, I would use either a network cable or wifi instead of a powerline unit – I only ever use those as a last resort.

  58. Allan Howarth says:

    I did all the steps above and rebooted the Synology NAS, but still getting upload speeds of 10Mb/s.

    1. Bob McKay says:

      Hi Allan,
      If you need help from the group here you’ll need to give a lot more information (how are you connected, what are you copying, what’s the listed speed of your connection, what hardware, etc.)
      Bob

  59. Dave W says:

    Found this page today and it has completely resolved my slow transfer speed issue. I was contemplating creating a subnet and using a second router as I originally thought it was a routing issue but this simple change has increased my transfer speeds from ~20MBPS to ~110MBPS. Absolutely brilliant – thank you so much! 😀🙏

    1. Bob McKay says:

      Hey Dave,
      Thanks the comment and glad it helped!

  60. Joey says:

    Hey Bob,

    Hope you’re doing fine and thank you for this article which has helped many people!

    I recently bought a DS218 to backup my projects that are really important to me. However, currently its only throttling around 300kbps of download, and 20kbps of upload. After your suggestion its still the same. In the first 5 minutes or so it was around 20mbps, but then it started to drop really fast. At this current pace it will take me 11.5 days and that is not acceptable. Is there any way of fixing this issue before sending it back? I am using a MacBook Pro 2018 running macOS 10.14.6 Mojave. Backing my data via Cloud Station which is connected via IP (192.168.x.x). No other processes are running, CPU is at ~5% and RAM around 15%.

    Hope anyone can help.

    Joey

    1. Bob McKay says:

      Hi Joey,
      Are these projects website projects by any chance? I only ask because what it sounds like you’re hitting is the administrative overhead of small files (which occurs no matter how you transfer them, even copying to a local disk). If that is the case, there’s a number of ways you could solve this and its about choosing the right one for you but firstly I would recommend using some sort of sync tool rather than doing a full copy each time you want backup a project – a smart sync tool (such as RSync on Linux or RoboCopy on Windows) will copy on the files that have changed, making it perfect for website backups and it can run in the background on a schedule. Other ways you could do this are:
      Store the projects on the NAS and work from there (backing up the NAS to the cloud for CloudSync)
      Backup the files from your PC directly to OneDrive/Dropbox/Google Drive and use CloudSync to download a copy to the Synology
      Zip the projects before you copy them (a zip of the same files will transfer quicker)

      Hope this helps

      1. Joey says:

        Hi Bob,

        Thank you for your reply. The projects are not for websites but for music stuff, so still could hit the administrative overhead of small files probably. 1 folder of 225GB contains 120614 files! I still have slow speeds but ordered a ethernet adapter today. Hopefully that will make a difference. Thanks for your tips!

  61. Lawrence C West says:

    I’ve had a Synology DS416play with 16 TB of disks for nearly 4 years now. I have been unable to use it for backup due to horrible performance. According to Resource Monitor, the transfer rate is only 3-5 kB/s at peak! In two weeks, 1 TB of my laptop data is still not fully transferred. When I use a USB3 disk the full backup is only a couple hours.

    On my old laptop, everything else operating went to a crawl, and the backup never finished after weeks!!!
    On my new HP Zbook with an i9 processor, the CPU is no longer being overloaded, but the backup is still crawling. I have a Gb/s Ethernet wire connection with a Gb/s hub only a few feet between the laptop and Synology.

    I tried all the settings suggested above, without success. Actually I’m stunned people get Mb/s not Kb/s, yet still complain. How does anyone get the Synology backup to work? My previous Windows Home Server worked way better, but no longer supported, unfortunately.

    1. Bob McKay says:

      Hi Lawrence, so that I don’t waste your time telling you things you already know, let me know your experience, etc. A bottle neck that small is definately not going to be processor related, something else is going on. A few questions:
      1) What speeds to you get if you simply copy a large file to and from the NAS (not a backup)
      2) It sounds like you’re doing a full system backup (e.g. whole PC/laptop), is that correct?
      2) What backup software are you using to perform the backup?

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