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!

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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5 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!

  2. Margaret says:

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

  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.

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