Adobe Premiere Elements 8 SLOW please help

any of you use Premiere elements 8 ?
if so, please let me know why my video is so slow on propagating or loading in the background so i can work on it real time? i use corel video studio and its super fast, why would elements be slow?

o ya my PC is pretty fast with plenty of ram, 8gb ram, quad core, 9800GT.





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