Microsoft admits another Windows 11 bug is slowing down PCs (storage drives)

Windows 11 is apparently impacting the speed of storage drives (NVMs, SSDs, hard drive) and Microsoft has confirmed the reports doing rounds on social media.

Not everyone will be affected by the issues highlighted here, but some users have found that Windows 11 is particularly bad at slowing down various PCs unlike the November 2021 Update for Windows 10.

Not only Windows 11 is making PCs slower to boot, but some people have also noticed their storage drives offer slower input and output operations per second. Additionally, there’s another bug that could reduce the read and write speeds of the drive running Windows 11.

If you’re affected, your Windows 11 installation could act slightly slower than before. In most cases with a traditional configuration, the difference between Windows 11 or Windows 10 won’t be dramatic or even noticeable, but you might experience performance issues when the system drive is being actively used to install large apps or transfer files.

In rare cases, Windows 11 could reduce the write speed of drives by up to 45%. As a result, Windows 11 won’t be able to load up apps or open folders instantly.

The problem is well documented on Feedback Hub, Twitter, Reddit, and Microsoft’s answers forum too. According to sources familiar with the development, Microsoft is actively investigating the issue and a fix is already available via Windows Update. However, the patch is currently optional.

Microsoft to fix Windows 11 performance issues

In a support document published on November 22, Microsoft has also acknowledged the issue, first identified in August, and has started testing a fix as part of the optional update (KB5007262) for the operating system.

In a statement, Microsoft officials confirmed the bug affects the performance of all disks (NVMe, SSD, hardisk). This happens when Windows 11 performs unnecessary actions in response to write operations. However, it’s important to understand that the bug won’t affect all partitions or drives.

Windows 11 performance issue occurs when a feature called “NTFS USN journal” is enabled. On Windows 11, this feature is enabled only on the C: disk by default and the rest of the partitions or drives are unaffected.

Based on the number of reports, it looks like the bug is not widespread and it could be due to the slow adoption of the new operating system.

Microsoft isn’t forcing Windows 11 on users as it did when Windows 10 was announced in 2015. Windows 11 remains optional and it’s currently running on a small percentage of PCs, according to data from third-party networks like AdDuplex.

Regular users may wait for the fix to be included in the Patch Tuesday (security update), which is set to launch on December 14. If you feel your device is slower than before, it is advisable to install the optional update (KB5007262). Optional updates are generally safe and tested/validated by Microsoft.

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