Thanks I guess I was trying to push more info but didn't come out.
Here the story
I am editing a series of GOPRO trailers (30mps) HD
The app seems to work fine but I notice has some difficulties to keep up with the frames.
I was just using the razor to trim or do other basic functions and suddenly it crashes.
It reopens with no loss...great mac.
my system is 3.4 Ghz Core i7
CPU : 16 gb 1333 Mhz DDR3
Graphics :AMD Radeon HD 6970M 2048 MB
Software : OS X 10.8.2 (12C60)
GoPro is usually H.264 in an MPEG-4 wrapper. This media should be optimized in FCP or converted before it's brought into the application. Check the frame rate of the original files in the QT player's movie inspector. See if they are 30fps or 29.97. Check the audio as well. It's probably compressed. Optimizing will convert it to uncompressed. What drives are you using? The internal? A fast external would serve you better, especially with optimized media.