Steam Frame Freezing At High Speed

I have noticed that when I go above 55/60mph, no matter what route I am driving, I noticed that for a split second, the image freezes before continuing, the FPS counter goes red, down to around 5/10 FPS, and then resumes, it looks like the graphic engine is struggling to keep up, but looking at my resources, it's using just under 50% of CPU, GPU and memory, so there should still be plenty of processing power, this happens every 20/30 seconds when going at that speed or above, is anyone experiencing the same thing?