I am making a little home movie from HD footage shot on a Canon HV10. I have a file that is about 800mb in size. I am using FCE4 to edit. The edit machine is a Mac Pro 2 x dual core Xeon with 5gb Ram and a dedicated 7200rpm HDD. What I am doing with the clip is speeding it up (it is a clip of a sunrise) by 800%. This does not require rendering. When I play the clip back I get messages about RT extreme (which is not enabled) and dropped frames. I am a noob with editing. What can I do to resolve this? Do I need to scale down the size of the clip? What is the best way to do this?