KSP limits to 21 FPS during alt-tab navigation
KSP limits to 21 FPS during alt-tab navigation
This problem only occurs in Kerbal Space Program. It appears when switching between windows using the Alt key. I resolved it by disabling full screen before launching again. The fix also worked by restarting the game. My system specs are 1070, 6600k RAM, 8GB. I use a G-Sync monitor at 144Hz and a secondary monitor at 60Hz. I updated my graphics drivers after the issue began. No further details needed.
This is a bug with the Unity game engine, it doesn't use an exclusive fullscreen mode and sometimes when you alt-tab out it doesn't kick back into full performance mode the way it should. However, you can fix it by adding this to your launch options to Steam (if you have it on Steam, you can add it to a shortcut if not): -window-mode exclusive The game acts a little weird in this mode, sometimes the window will drop out briefly for moment and then come back when you start the game, and alt-tabbing will get little more unreliable but should still work. No FPS drops this way though.