Presto! VideoWorks and Frames per second

I'm using Presto! VideoWorks and im just messing around with video from my MiniDV camcorder (sony DCR-HC26) and i notice when it transfers over to the computer through firewire the video gets lagged up every 10 or so seconds and then plays somewhat well. I was wondering is this a fps problem? It's sending at 30 frames per second... should that be higher or lower? If so, how do i do that? The little frames per second box where it shows "30" is not highlighted indicating i cannot change that.