The Top 15 Reasons Your Synology is SLOW (and how to fix them)

This tutorial goes over the 15 most common reasons why your Synology NAS is slow with large file transfers. It is split up into three major sections, network, disks, and the Synology itself.

#Synology #Tutorial #NAS

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Sections:
0:00 INTRO
1:05 Setting up Baseline testing
3:10 Reason 1: You are on WiFi
5:21 Reason 2: You are saturating your ethernet connection
7:05 Reason 3: You are using LACP with a single connection
8:45 Reason 4&5: You do not have Jumbo frames enabled / have them enabled wrong
11:12 Reason 6&7: You have SMB setup incorrectly
13:22 Reason 8: You have too few disks
16:46 Reason 9: You have a slow / failing disk
18:42 Reason 10: You have a SSD write cache that has filled up
21:40 Reason 11: Your disks are full / need to be defragmented
23:10 Reason 12: You are using SHR and have fewer disks to write to
25:40 Reason 13: You are writing to an encrypted share
26:30 Reason 14: Synology Drive is enabled on the shared folder
27:39 Reason 15: Your Synology is busy doing other things
28:33 OUTRO

[lakshanthadissanayake]

Bought a Synology NAS recently and now your videos have helped me to learn a lot about Synology! Thank you for all the hard work! cheers!

[geoffc]

Still a great video! One thing of note re: Jumbo frames. If you enable Jumbo Frames on your NAS and the rest of your LAN is not 100% Jumbo, you may experience frequent disconnects, failures to connect and outright inability to use the NAS. It can be a WHOLE LOT WORSE than just 'slowing down your network'.

[SooksVI]

Very helpful video. Synology Drive was the reason for my slowdowns.

[lefty]

Yet again very easy to follow video with good information. Keep up the good work 👏

[williamharrold-dc]

Very useful. Helped me debug speed issues with my home setup and identify what is fixable and how.

[fzovko]

Your videos always great! I am a long time System Engineer and I learn lots from your videos. Keep up the great work bro :)

[thefilmpoets]

For wifi, I don't get how I can upload at 500mb/s to google drive, but my NAS is about 50mb/s ? Like what's the reason behind it?

[Ramserik]

You are reading my mind! Was just about ask this question. Thank you!

[Sauromalus]

I had an entirely different network-related reason. My Sonos system created a network loop on my Unifi switch—the same one that the NAS was on. It had some kind of broadcast storm that saturated the switch and dragged me down to 1MB/s. I found this out after moving the NAS to a different location and testing the speed, then returning to the original location and unplugging various things in the switch.

[fermento]

This is awesome. I came looking because after a major upgrade from 6.x to 7.0.1 noticed a big performance hit on the SMB share.
After fixing the SMB share settings it's performing nicely again. Will be following a few other of these tips too. Thanks!

[Wesmosis]

Great video as usual SpaceRex! quick question please, I just bought 2x 2TB ‎970 EVO Plus SSDs to install them on my ds1520+, are they overkill? my usage is plex, playing media, 3 plex users, reading PDFs here and there, storing media files.

Is the the size of those SSDs considered overkill? Do you still recommend RAID 0 SSD read only cache?

[OttrWorks]

You answered so many of my questions in this video, been wracking my brains on 1gig/125mb speed i've been getting. Had no idea bites and bytes are different, thanks!

[wbwright]

all of this is great. however, it does not explain why natively the Synology streaming performance does not stack up to a 15 year old WD MyCloud simple 5400 rpm single drive unit sitting right next to it on the same network. the pointers are appreciated however, and i have learned new things. thank you!

[gds]

Great tips, very thorough! Here's one that I personally had missed in my 10 Gb implementation... in PC's Device Manager, be sure to change the Network Adapter card driver in Properties/Advanced/Jumbo Packet from its default of Disabled to 9014, Doh, Doh, Doh!

[seb_gibbs]

Another one to add is if you have file compression enabled on the shared drive. I would not really recommend this option for anything.

I currently have it enable on an archive folder, and have been moving large zip files to it, but its very slow because I'm essentially zipping and zip file, so isnt saving me any additional space while take far long to read and write to it.

[gred]

thanks for all the great videos. I installed CrystalDiskMark, but cannot figure out how to test a NAS mapped drive. Only the local drives show in the program, and I do not understand his instructions for network drives. Could you clarif?

[MikesTropicalTech]

I'm working with Synology support on SMB file corruption but I checked and don't have multichannel enabled. thanks for bringing that up though.

[BruceGou]

Thank you, the explanation of link aggregation solved my concern!

[Provid]

Mine was slow because of a few reasons:
- uninstall some of the apps on the synology that I'm not using (I think they are called moments but idk for sure - I think they also call them apps)
- turn off the indexing programs
- started freeing up space (it was almost full)
Those things brought it from a crippling 5mbps to about 50MB/s. That's INSANELY different speeds.
I'm on the DS220j - my other Synology with 5 drives transfers faster than 600MB/s read speeds over a 10gbs connection. And fully saturates a 2.5gbps connection (200+MB/s) since my Mac doesn't support the 10gbps usb adapter I'd bought. Fast enough to archive data for sure.

[GuillePozzi]

Would love a video on how to setup that FAST bulk volume vs the Synology Volume.