Now having discovered that i still have never noticed any slowdown on anything that ive put on my phone and it definately runs my apps faster than my android experia x10 because occasionally i have had slowdown on that. The only time ive had slowdown on my windows phone has been my fault and its always occured when using fontmachine.The problem i had was placing a displaytext function in the wrong place like inside a large loop.So the result was i was displaying something simple like credits left but doing hundreds if not thousands of times within the loop.This caused massive slowdown,But once i discovered this its an easy fix and everthing ran great.You probably already know this but sometimes its easy to overlook things.Ive never had slowdown yet associated with velocities,friction ect but i suppose this would depend on how many objects you are throwing around the screen.Sorry i cant be more helpfull. I'm starting to wonder if this is a bug with SetUpdateRate or something. I KNOW that other games on my brand new Windows Phone are running at full 60FPS easily. I've played some impressive games already. So if Monkey games can't peak past 30FPS even with it set at 60FPS, there may be a problem. We should get mark to update the base project as Microsoft basically no longer support pre mango now. They announced a while ago that all handsets have been upgraded and everyone should move up to mango releases. Im still having probs