Odd, I'm showing the opposite effect over here... Desktop win 7 64 bit amd FX-4300 quad core cpu twin radeon 6970 gpu in crossfire mode 16Gig ram Gonna double check with something that can actually fly. Edit: Same craft flipped to point upwards. Waited for mach effects to start, and noticed that the fps counter always stayed constant, despite the obvious increase in lag Without Physwarp: Slightly smoother framerate, but in-game time was ticking up at about 2-3 seconds per in-game second. With Physwarp: Framerate tanked, but in-game time was going up by about 1.5-2 seconds per in-game second. Sooo.... something's up with that still.