Hello, I'm working on a what i thought would be a light weight project. Im just doing straight cuts, no graphics or multiple layers. Its 2.5 minute video and i can't edit for more than 5 minutes before playback lags then crashes. This is the first thing I've done with premier since about 1999, which is how I remember it working then too. I'm just trying to make art!!!!!! why why why won't it work!!!??!?!?!?!?