I'm completely stumped with this. I came on this morning for a game of CSS and found that it was unplayable because every time I moved my mouse the game lagged so badly.
This would be more bearable had the game not been working completely fine the night before. I haven't changed any settings or drivers since last night and now I get these unexpainable FPS Drops. The only thing that's changed is that I had a few Steam Updates to do this morning, I don't think they affected CSS though.
If you need any specs or settings, let me know which ones. Thanks in advance.
EDIT: Forgot to mention, I've tried it with other games like GRAW2 and they work completely fine. Atm it's only CSS that I know has this problem.