https://www.bleepingcomputer.com/news/microsoft/windows-10-kb5003690-fixes-issues-affecting-gamers-since-march/

Microsoft has fixed performance issues impacting gamers running Windows 10 21H1 with the latest Windows 10 build released for Insiders in the Beta and Release Preview Channel.

"We fixed an issue in a small subset of users that have lower than expected performance in games after installing KB5000842 or later," the Windows Insider Program Team said.