Ever since the recent update this game plays like a slideshow. I played the game for a while before this without issue. Since the update, the game starts up fine, and everything seems like its gonna work fine. But then about 2 minutes into game play the whole thing seizes up and i get about 5 frames per second (the sound comes through choppy too!). Minimizaing the game (alt-tab) shows that the rest of my pc is running fine and lag free, but returning to the game it's still crapped out. After about 4 minutes of the game being laggy as hell it returns to normal for another 2-ish minutes....repeat. Any ideas?
The lighting changes might have something to do with it, try fiddling around with your graphics settings. Also, you should post your graphics card, RAM and the like.
What about other 3d games? It kind of sounds like your graphics card is overheating. Make sure the fan is spinning properly, and dust out your machine
I had this exact problem a while ago with TF2, it was an overheating graphics card. Is your card on-board? Although my framerate dropped significantly with this patch. I'm getting major lag on single digit ping servers. Game used to run smoothly before. The lag is constant though, not in the spurts Omni is experiencing.