I was just running Crysis 1 on my brand new PC today on all High and it was working beautifully. Got off, played some League of Legends, and then tried to get back on, but the lag was so unbelievably horrible. Going through the intro titles was atrocious, it would keep looping every sound, and when I clicked load game, it would just freeze and not load anything. I'm running it through Steam. I tried restarting my computer, but that didn't seem to work. For now I'm just going to retry in the morning, but hopefully if not, I'll have some better answers by then. Thanks for any help you can give.

Can you give us your PC specs?