Colorista slow in Premiere

I have this project that needs color grading, but the client insists on being able to recut/shorten AFTER grading (I know .. I know..!). Much as I am beginning to really like Speedgrade - this requirement effectively rules it out of my workflow.

Colorista seems like a reasonable alternative choice as it sits there right in the Premiere timeline. The problem is that it is SLOW. I move a color wheel, and it takes a moment to update in my program window. Clearly this is hopeless!

Any ideas how to make it go faster? ... I have an IMAC with 16Gb RAM and the 6970 card that Adobe are not yet supporting. Could this be the answer? Or is there something simple I am missing. I tried lowering the paused resolution in the program window but that made no difference.

Thankyou,

Jon

Jon Felix
RAINDOG MOTION PICTURES
Los Angeles