I've been playing doomsday/doom under Linux (gentoo) and noticed that my system usually does 60 FPS, but depending on (perhaps?) other things running on my system I may only get 20 FPS, and (rarely) 30. I discovered I can reset it to 60 FPS by going to video settings, selecting fullscreen, then deselecting fullscreen again. Unfortunately I have to do this every time I start a level.
Anyone know what's going on here? Is there a way I can hard-set the FPS to 60?