Xbox controller causes performance spikes/slowdown on Windows

[offalynne]

See: YoYoGames/GameMaker-Bugs#5389 (comment)

Anyone who encounters this bug and would like it fixed is encouraged contact YYG

[offalynne]

YYG have marked as 'wontfix' and pass the buck to GMRT

A partial solution for titles launched through Steam -- opt-in Xbox controllers to Steam Input in the Steamworks backend. Do not enable a loading splash graphic, or this will crash the runner on launch.