Fraps recording at 20FPS tops?

Until recently, fraps has been running like a babe on my system, I'd hit 60 FPS and create great videos using it, but recently it has been playing up. I can't record without hitting a solid 20 fps or lower, all my fraps movie folder is cleared out but it's lagging like hell. I own a youtube channel and in all of my videos I'm getting great FPS, I just don't know a reason for it doing this. I haven't done anything to my rig and changed nothing, it just doesn't work. And I'm trying to release out a montage and it won't let me because of how laggy it is. I play Minecraft and record it btw, that's what the lag is on.