Hi, I have a macbook pro 2013 baseline with intel 6100 and an i5 8 gb ram. I can never get HF 4pro to work well- canon 15i footage barely plays well, and eve with 1 clip in the timeline, the clip sttters and drops frames. I haven't changed ANYTHING to the card, camera or the way I work. It just started getting slower and slower, since the last few edits I've done. The export time is the same... but the timeline preformance is unacceptable. What is wrong? why so sudden? I keep asking these questions to the forum and I never quite get to an answer that always works (clearly). I don't think this is what a program like this should be doing.