Windows 11 Slows Down on NVMe SSDs, Performance Tests Reveal


Windows 11 is experiencing yet another slowness issue, this time related to crashes with NVMe SSDs. Devices that are supposed to speed up the loading and performance of the operating system make it even worse. There are several complaints threads on Reddit and Microsoft support forums about bugs related to this important storage component.

The problem isn’t exactly new, as test versions of Windows 11 already had it, but it still persists to this day, even two months after the official release. Tests conducted by users on the benchmarking applications CrystalDiskMark and AS-SSD revealed this reduction in performance caused by NVMe drives.

The flaw specifically affects write speed quite significantly. In the above comparison, you can see the difference between the SSD running on Windows 10 and Windows 11. This appears to be a trend for NVMe drives in general, although the results will vary due to a number of computational factors.

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For now, it is not clear what causes this failure, but several theories have been raised in the debate forums. The main suspicion would be that the system virtualization-based security (VBS) is part of the cause of the reduction in performance.

Another theory is related to the installation files of the system itself, as this drop in throughput does not occur when the test is run on a secondary drive. This would be reinforced by this experiment, which compared two 2TB Samsung 980 Pro NVMe SSDs on the same machine and gave the following result:

Notice in the screenshot how the speed difference is almost five times in RND4K writing. The Samsung 980 Pro is a PCIe Gen 4 SSD, but older PCIe Gen 3 drives are also affected.

Slow SSDs on Windows 11

Some reports point out that the latest Windows 11 update, build 22000.348, slightly improved the performance of these storage devices, but that wasn’t enough to fix things. When the first complaints surfaced, a Microsoft software engineer recognized the problem and said he would work on the fix, but so far it hasn’t gone beyond the realm of promise.

It is possible that the advancement of system installations, accompanied by the increase in complaints, will help the company to focus on solving this failure. Windows 11 has already been affected by other compatibility issues, such as the reduction in performance of AMD processors, internet sluggishness and even the exaggerated consumption of RAM memory.

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