Windows 10 Cumulative update KB4482887 can affect gaming performance.

Thank you for sharing the information about the known issues related to the KB4482887 update for Windows 10 build 1809. It's important for gamers and users of graphics-intensive applications to be aware of any potential degradation in performance due to such updates. It's helpful that Microsoft has identified this issue and is working on a resolution.
For users who are facing performance degradation with desktop gaming after installing KB4482887, uninstalling the update temporarily might be the best course of action until Microsoft releases a fix. Keeping an eye out for the upcoming release with the resolution is recommended to ensure optimal gaming experience on Windows 10 version 1809.