I just did a test with my Mac Pro (early 2009) and Macbook Pro (2011). I started a RAW to JPEG batch conversion with Lightroom and played a 1080p .MOV file with the VLC player. The Mac Pro didn't have any problems with it. The Macbook Pro (2,2Ghz, 8GB RAM, 500GB 7200 rpm hard drive, Anti-Glare screen) couldn't handle it...during playback the video froze every couple of seconds. Could you guys do the same test and post the results here?