i have vegas pro 8, and my PC has 8gigs of ram, about 600gigs of memory plus an external 640gb harddrive....it has an AMD quad-core processor...and im editing unprofessional miniDV footage form a consumer camcorder with not very good quality, BUT when Im editing my preview video lags and goes like at 20 frames when i do some effects...i think my computer shouldnt be doing this.. Any suggestions on what I can do?...







