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Source Edit Plays fine, but timelines are slow – no effects.
The title pretty much says it all. I started a new project in Premiere CS4 and imported a lot of MTS files from a Canon camera. All the imported movies play nice and snappy in the source edit window, but the edit window/program window – the window on the right where you see the result of your timeline editing – that is real sluggish and drops most frames. Audio runs but the video only updates every second or so. There are no effects or transforms or anything – just cuts at this point. Where can I look to find the problem? BTW this is my second project, and I had no such problems with the first one.