prospect clips very slow premiere cs4
 

Hi everybody. I'm using the new beta of prospect for cs4, because i wanted to buy it. HTe problem is that i can't play any kind of clip i converted (both high or medium quality) easyly in premiere. The preview, with no effects is choppy and never fluid. What can I do? is normal?

My configuration is Q6600 OC 3.2GHZ 8GB crucial ballistix 800mhz 4-4-4-12, Nvidia 8800GTS, HD 500GB RAID0 HD320GB OS..

I played normally cineform clips in CS3, but I can't with this...