Just got a Gopro (love it) took video (1080 48fps) straight off card and copied to SSD drive on MP. Was surprised playback with QT stutters now and again. Scrubbing in QT is very jumpy. Copied same file to MBP and it's silky smooth, both in x1, faster, and scrubbing back and forth. Can't fault it. Looked on Activity Monitor, found some significant differences: MP: QT CPU ~18%, VTDecoderXPCService CPU ~130%, Disk read 3-4Mbit/s MBP: QT CPU 15-18%, VTDecoderXPCService CPU 0%, Disk Read: 3-4Mbit/s when the mbp stutters that coincides with both QT and VTDecoder' utilizations dropping significantly too. Any one any idea why I'm seeing this difference in behaviour? Configs: MP: 2008 8 core, 2.8 GHz, 20GB, SSD boot, SSD scratch (where file is), spinning 'data' drive, HD5870 MBP: 10,1 2.3GHz i7, 16GB, factory SSD.