I'd say it really depends on the map and who I am playing with... if it's like the coolest map I've seen then I'd go to 30-40 without a problem, if not then I'd leave when the frame rate is around there. My computer intends to change the frame rate in intervalls though (which is VERY annoying), so most of the time is goes like this with "laggy" maps:What is your braking point?
You realise there's quite a difference from let's say 20 to 50 fps? Have you never watched movies or shows where the fps is clearly higher?You realize that the human eye sees at about 20 frames per second, right? 60 is just plain unnecessary. Movies these days are 24 (sometimes 30 I believe) fps. I'm happy to get movie quality.