Sudden large problem with frame rate

I got this game 2 weeks ago, been having a lot of fun with no issues, but today I booted it up and suddenly the frame rate is ABYSMAL. As in, bad enough to render it borderline unplayable. I also looked at task manager to see if there was anything else that was running in the background that needed to be stopped, and SSL was taking 70% of my CPU while a firefox browser with 10 open tabs was only taking 2%. This issue has not cropped up with other steam games. I've tried verifying files, reinstalling the game, and restarting my laptop multiple times. Any suggestions?