That question was asked on forums probably not once, but do anyone have problem with FPS in the game, after you go to desktop multiple times? It doesn't happen when you do it once or twice, but if you stay on server for few hours and do it lot of times, then there's perceptible drop of FPS, lets say from 100 to 70. If so, is there any way to fix it?

Sorry if this post is in wrong forum section

i guess if you have V-Sync enabled?

It's not enabled I think