https://www.bleepingcomputer.com/news/microsoft/windows-10-kb4482887-cumulative-update-causing-major-stuttering-in-games/

The February KB4482887 Cumulative Update for Windows 10 Version 1809 is causing major graphics performance issues in multiple games, from FPS drops and mouse input lag to severe stuttering and lag spikes according to numerous user reports.

Microsoft also confirmed the problem when it added a new known issue to the list available on the KB4482887 Cumulative Update page: