Choppy Playback on a system that once ran it smooth…

Has CS6 caused anyone else to lose smooth playback?

My system ran CS5 and played the video smooth (Canon DSLR footage)

i7 940, 12GB RAM, GTX 480 with the hack…..9 hard drives–RAID’s….(0,10)

Before I get into the system spec details, has anyone else noticed a decrease in performance in CS6?

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