Windows Update likes to kick in when I'm playing online, making fps drop to 10. Tried all the buttons to make it ask before downloading stuff but it didn't help. My last punch was disabling the Windows Update service.
Please don't disable windows update for gaming. There is a gaming mode (which really ought to be called normal mode) which should help. The only other stipulation is you must keep your computer plugged in, turned on, and connected to the Internet as much as you can so windows can do its thing while you're not using it.