When I scroll across the timeline, my video stops, lags, and then catches up. Also when I move to another section of the timeline, it take a few seconds for the waveforms to become visible in the timeline. Are these indications of a slow video card.
Dell Vostro 470, Windows 7, Intel Core i5-3450 CPU @ 3.10 GHz, 8 GB RAM, 64 bit OS, Geforce GT-620.