I have a Macbook Pro 15" i7 and I'm editing from the internal HDD on Final Cut Pro in a 720p H264 timeline.
I've noticed on playback over some simple cuts with the blade tool that the playback is stuttering a few frames. It then picks up but I loose about 6 or 10 frames and that can be quite crucial in editing some music videos where synching matters immensely.
I've also noticed a few frames jump in randomly from other cuts that I have made. I am using a 4minute long clip and sourcing my footage from that so maybe the frame popping in is something to do with that?
Both of these issues don't effect the export (using current 720p H264 settings from the sequence) and resolve, but in other places the export seems to stutter in completely different places to the problems when playing back in FCP.
Any help is much appreciated, this little annoyance is slowing down my work flow!