Stuttering with this new update.

This update just messed everything up, I was having a blast up to now. I cqc and mid range snipe and stuttering is getting me killed. It used to be so smooth, now I stutter every time I'm in a gun fight. I hope this is a known issue and gets fixed. Also the main menu glitches out and I cant even search for a game. I need to close the game and reopen to find a game.