Not actually sure what it is, but; Okay: I had lag on steam release. I didn't have any lag after the hardware upgrade. Ever since the last update hit, I still haven't had lag.. initially. But now if I leave the game running long enough, it totally starts getting lagged up, and not spurts based around activity, but the usual escalating intensity associated with memory leaking. Doesn't seem to matter if I open the co-op chat or not during the time span.
Mine has been doing that for as long as I've been playing. A couple of days ago it got above 1.3 Gig of memory usage. About a Gig more than necessary.
