A few questions need answering...
What memory card?
How are you importing? Via card by taking card out or straight from the camera?
What frame rate and size? i.e. 60f 720hd
Also, spec of PC or Mac and how old... What software are you using for playback...???
Height 5"11, Weight 200-210lbs, Born 1969
Regular Stance, Ability NOT GOOD
2012/13 114 days
2013/14 102 days
K2 Fastplant 154, Ride DH2 158, Endeavour Vice 155, Signal OG 155, NS Evo 157