Graphics Settings?

[Bnastyyy920]

I have a Asus Gaming a computer. Plays the game very nice. I can run 40 man gate on outdoor. With no lag. But as soon as I start up a supercross track. Mainly the replica supercross rounds
It's a bit glitchy?? I run my settings on normal. If I turn them down to high fps it runs just fine but really crappy graphics lol.