I just bought a brand new 13 inches unibody Macbook Pro 2009 2.53 GHz, 4 GIG Memory, 9400m video. I installed Snow Leopard and latest Perian 1.1.4. I tried playing James Bond - QOS 720p mkv and QT7 loads the movie but it is terribly slow, constant stuttering with video and audio and ultimately freezing up. Is this expected because perian fails to utilize the hardware properly or am i doing something wrong (please help if you know how to fix this)? If this is expected, is there a better way to play MKV while retaining Front Row functionality. If there is no way to play MKV in quick time/Front Row. What is the best option out there as far as player? Thank you guys. I hope this thread helps many people with the same questions.