Windows 10: Slow NAS transfer speed after Win 10 > 11 clean install

I did a clean install the other day to take me from Windows 10 up to Windows 11 and ever since, my transfer speeds to my Zyxel NAS have been substantially slower around 17MB/s tops. Previously I would get speeds of at least 80-100 MB/s, so transferring files from my PC to the NAS is taking easily 4x longer compared to before.Nothing has changed with my PC hardware or network hardware, nor the configuration. I have tried swapping cables as well. The NAS and my PC are both connected via ethernet directly to my router, and the NAS has a static IP address. I'm on a 1000Mbps internet connection a

:)

 

File Transfer Speed from Windows 11 to Synology NAS is VERY SLOW vs. Windows 10

I have a new Windows 11 PC and I'm noticing that the file sharing to my Synology NAS is very slow vs when I transferred files from my older Windows 10 PC.

File Transfer Speeds:

• Windows 11 to NAS (DS1520+) = 11.5 MB/s
  
• Windows 11 to Windows 10 = 112 MB/s (much faster)
  
• File size = 30GB
  

Note:

• Windows PCs and NAS are all Ethernet connected on 1GB home network.
  
• Running: Windows 11 Pro 23H2
  
• Running: DSM 7.2.1-69057 Update 5
  

Any suggestions on how to speed this up would be greatly appreciated. Thanks.

***moved from Windows / Windows 11 / Performance and system failures***

 

NAS transfer speeds


Hi there

what are you using as a NAS box. Windows 10 should be just fine. The other thing is if you are using those electrical thingy's for Ethernet connection they can be hideously variable in performance.

I'd check your Network stuff first - the Wifi option works for me (wifi Ethernet bridge with 2nd router). If your network connection is fine I'd suggest a cheap RAID controller and improve HDD performance - but if you've got SATA connections the max theoretical throughput should be at least 3 GB/s - on modern HDD's could be 6GB/s -- although you won't actually get that speed from the HDD's themselves.

Can you also test running a file transfer from your computer to an external USB HDD -- the bottleneck might actually be in the PC !!! and not the NAS. USB2 external device will probably transfer at 20 - 40 mb/s , USB3 external HDD probably 100 - 150 mb/s (these are for portable self powered HDD's).

If the computer is slow then that's it -- NAS should be fine. If you have USB ports on the NAS see what HDD transfer is directly by connecting the device to the NAS - most decent NAS boxes will have at least one USB 3 port.

Cheers
jimbo

 

Copy speed very slow in windows 10

Using NAS Network mirror drive SATA to NEW USB3 thumb drive.

If downloading from the 120 MB Internet to the NAS, speed is constant.

PC SATA to NAS, speed is high.

The USB 3 starts out high, then drops off.

You might look at:

Speed up and fix slow USB flash pen drive data transfers

Windows 10 may have added this API (see step 3 here)

Windows 10 Slow Deleting or Moving Files? Here’s the Real Fix