I have a weird issue that I've never seen before in a single player game. Every so often, the game will freeze/stutter... but not entirely. It does so in a way that is akin to how some games act when there are network issues. If you've ever played an FPS where your internet or the game server is having issues and suddenly everyone else starts running in place, but you can still look and shoot and move around, and then suddenly everybody zooms around the map before everything settles back to normal... well, that's what's happening to me, except in single player. For example, I can be shooting an enemy when suddenly he freezes in place and no longer loses health damage, even though I can still move and shoot. Then after a second or two, he suddenly and instantly takes all the damage I've done to him during that frozen period and moves in fast motion for a second or two as if to "catch up" to where he would've been had he not been frozen. I've tried everything that's generally mentioned in FPS/performance related posts (64 vs 32 bit, no steam overlay, no mods, using performance enhancing mods, running without steam directly from the folder, running the game with and without administrator privileges, verifying file integrity with steam, etc. etc.) Nothing helps with this issue. Has anyone else experienced this or have any idea what might be going on?