The rollout of Windows 11 2022 Update is now underway, but on the other hand, Microsoft is closely monitoring everything, just to make sure new bugs are discovered early
This is what happened this week, as the software giant says it discovered slower SMB read performance for large files in the new Windows 11 feature update.
Microsoft’s Ned Pyle explains in a post on the forums that the slowdown could go as high as 40 percent due to this glitch.
“There is a performance regression in 22H2 when copying larger files from a remote computer down to a Windows 11 computer. A large (multi-GB file) might see as much as 40% less throughput over SMB when copying down (reading). Copying that same file to a non-22H2 machine (writing) won’t see this problem,” Pyle explains.
The workaround isn’t necessarily complicated, as Microsoft says users can just turn to robocopy or xcopy with the /J parameter for unbuffered IO.
One such example for the copying command is this:
robocopy \someserver\someshare c:\somefolder somefile.ned /J
In the meantime, the software giant says it’s already working on a full fix, but for the time being, there’s no ETA as to when it could go live.
“That will return your performance to 22H1 throughput. The issue is not actually in SMB code, so I can’t give you an ETA for a permanent fix yet; SMB is just the most likely scenario to be noticed. You could see this behavior even with local file copies not using SMB. We’re working with another team to understand this and get to a permanent solution,” Pyle explains – of course, you need to customize the command with your own settings.
Needless to say, given the likelihood of devices hitting this error isn’t necessarily big, there’s no upgrade block in place this time.