Windows 11 only has 45% of random write speed in Nvme SSD

Question

As you see above, the other performance is about the same, but in RND 4K Q32 T16 the speed has dropped significantly. I know that because the two software versions are different and the condition of the computer is different, it is normal for the performance to fluctuate, but this performance also dropped too much, and the performance remained stable low after many tests at different times.

Answer 1

There are definitely many many others with this issue -- various threads here:

Windows 11 bug -- has crippled SSD (NVMe) Random Write Speeds : Windows11 (reddit.com)

Answer 2

I'd like to know that as well. But so far I have yet to see that Microsoft has verified the issue.

I am already glad to see that I am not the only one. Really started to doubt myself and almost had send in my SSD for a RMA because of this.

Honestly I regret upgrading to Windows 11, so far has giving me nothing but a headache.

• This above issue for Random Write issue.
• The Level 3 cache issue on AMD platform that still hasn't been fully resolved. Bandwidth is still very very low, only the latency is fixed.
• VR performance on WMR has been abysmal on Windows 11. My HP Reverb G2 ran great on Windows 10.
• Random hangs while working on my PC, making me have to hard reset my PC. Mouse still moves, but the entire UI just becomes unresponsive.

But yeah, those topics are for another thread.

Below screenshots of my results:

Samsung 980 Pro 2TB as secondary drive (Windows on another drive):

Samsung 980 Pro 2TB as primary drive (Same disk but now with windows running on it):

Samsung 970 EVO Plus 2TB now as my secondary drive (Windows on the Samsung 980 Pro 2TB):

You see that the Samsung 970 EVO Plus 2TB outperforms the Samsung 980 Pro 2TB when it comes to Random Write IOPS now. The latter is a PCIe 4.0 drive and the 970 EVO Plus a PCIe 3.0 drive. It appears only the drive where Windows is installed on is affected by the performance issue.

I firstly thought I did not have the issue after I cloned Windows to the 980 Pro, but I later saw that I did not run a benchmark. So I cannot confirm if the issue only affects clean install, or also updates.

But I can confirm the issue apparently is only present on the primary drive that is running Windows 11.

Answer 3

Could it be that the clean install enabled VBS (and it was not enabled previously with just the upgrade)? I believe upgrade installs do NOT enable VBS, unless you had it enabled in Windows 10.

Answer 4

Same here. When will there be a fix for this issue??

Horrible.

Answer 5

I have validated that VBS is not running by checking Device security --> Core isolation --> Memory integrity == Off

Also checking msinfo32 (System Information) Virtualisation-based security == Not enabled

I also tried setting the following Registry key:

Computer\HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Control\DeviceGuard

EnableVirtualizationBasedSecurity == 0

That also did not make a difference.

So far it appears the dirve only opperates at full Random write IOPS when it is not the primary drive running Windows 11.