Microsoft has figured out why a recent Windows 10 update is causing issues while gaming on some PCs.
«A small subset of users have reported lower than expected performance in games after installing this update. Most users affected by this issue are running games full screen or borderless windowed modes and using two or more monitors,» Microsoft explains in a support article. The issue is related to KB5001330 for Windows 10 version 2004 (20H1), and according to various complaints, it also affects KB5001337 for Windows 10 versions 1930 and 1909. Only the support article for KB5001330 acknowledges the issue, however, so if you are running version 1930 or 1909, you might be out of luck for the time being (unless you upgrade to version 2004). «This issue is resolved using Known Issue Rollback (KIR). Please note that it might take up to 24 hours for the resolution to propagate automatically to consumer devices and non-managed business devices.
