Insane Lag

Hi All,

Been around Premiere for a while now. For some reason, when I've been editing recently, my laptop just absolutely grinds to a halt. Premiere is lagging sooooo hard. I'm not doing anything crazy, no effects, just a few video files layered.

I have task manager open to monitor CPU and RAM usage and neither are too bad (around 80% at the most). I've closed everything else I can, I even downloaded a temperature monitor and dropped my preview frame rate and it's still just too laggy for the editing I need to do. Anyone have any advice?