I can hardly use SL now. When there are 77,000 on it the lag starts about 10 minutes in and at best my frame rate is the pits. What set up have you got and does it work effectively. I have been looking at getting a new pc and not using the Mac as SL is known to not be Mac friendly and I don't want to bork the Mac by using it. I would rather keep it for photoshop etc and get a dedicated pc for SL. Been looking at Alienware high performance pcs...but they are far from cheap.