I don't really recall getting a significantly worse frame rate on my desktop PC in Borderlands but it did seem a little slower in General Knoxx than it did in the main game...but now I'm out here at the deployed location and my G73JH can't seem to handle the Knoxx DLC at all. It feels choppy even at 1280x720. But the main game performs perfectly smooth. I'm wondering if anyone else has noticed anything similar?