Windows 11

Windows 11 22H2 version may fix a strange bug that slows down some PCs

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Windows 11 has an annoying bug that causes unexpectedly high CPU usage, according to several reports in Microsoft’s own Feedback Hub. The spike in CPU usage, which slows down the system, is apparently caused by a process called “sihost.exe”, also known as Shell Infrastructure Host.

For those who don’t know, sihost.exe is a core part of Windows 11 or any version of Windows. It is used to support the Start menu, taskbar and other important graphical elements of the operating system. For example, the transparency effect is also supported to some extent by sihost.exe.

There can be multiple reasons for high CPU usage caused by Shell Infrastructure Host (sihost.exe) and one of the reasons can be Windows 11. A bug in Windows 11 apparently causes a CPU bug and it also affects clean installs of the operating system, with users stating that a simple file transfer can increase Shell Infrastructure Host’s CPU usage.

“A clean install of Windows 11 on Lenovo ThinkPad-P72, installed all updates from Windows Update. The Shell Infrastructure Host (sihost.exe) starts and stays at 16% CPU with high fan speed”, one of the users noted.

Another user added that the high CPU usage is noticeable when they capture recordings/logs for feedback. A bug freezes the process and causes serious performance issues as it affects core components such as the Start menu and taskbar.

Fortunately, Windows 11 has received a new update in the Windows Insider program that fixes this annoying problem that causes high CPU usage.

Windows 11 KB5016700, which is still under testing, before full release alongside Windows 11 22H2, fixes a bug that causes high CPU usage. As noted by us, this was mentioned in the release notes of KB5016700 and we can confirm that the patch has fixed this fast processor usage issue.

No details were provided and Microsoft does not mention the root cause in the release notes.

“We fixed an issue that in certain cases caused sihost.exe to use a large part of the CPU,” Microsoft noted.

KB5016700 change log

Another big change with the KB5016700 cumulative update is that support for enhanced Microsoft Defender for Endpoint has finally arrived. Microsoft says the update improves Windows Security’s ability to identify and intercept ransomware and advanced attacks.

Fixed another bug where Windows Tablet Mode features could crash on some devices that do not have a touchscreen. Likewise, a bug has been patched that causes some apps to have empty sections in the task view preview.

Microsoft also fixed an issue where Microsoft Edge crashes or freezes when using IE mode.

As mentioned, Windows 11 KB5016700 is only available to testers and most of these changes will ship in September/October along with Windows 11 version 22H2. It’s worth noting that version 22H2 is only offered on supported machines and you can already check upgrade compatibility by browsing a registry entry.

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