GTA 5 GPU usage on Core i5 2400 @3.2GHz and GTX 780 @ 1215MHz

GTA 5 GPU usage on Core i5 2400 @3.2GHz and GTX 780 @ 1215MHz

Notice the FPS dropping when driving and then going up once I stop the car. I've done it a few times during the video so you can better see what I'm talking about. Yeah.. i5 2400 @ 3.2GHz is not going to cut it for this game. Low GPU usage and stutters galore. Or maybe another issue? Can someone give some feedback?