Credit to Raekwon in the video game thread, more BS apparently:
http://www.pcgamesn.com/how-to-turn-...dvr-windows-10
Last week saw one of Windows 10’s largest updates yet with the 1607 patch, aka the Anniversary Update. Along with the usual sweep of fixes, security updates and rebooting your PC in the middle of a work day, it also auto-enabled Microsoft’s Xbox-powered Shadowplay-like recording software GameDVR. While this is useful if you have both an omni-powered PC and plan on sharing clips quite regularly, it could be causing some major stutter. Particularly affected seem to be Valve’s games.