I see that you used more objects around track, and in long distance too. For good look track is important have good rating of fps. If not, others RBR fans can't ride on... As result may, sad, but track is only for himself... That's important good rating of FPS - for long life of yours creation, and may in future have convertation in original RBR file format... I see not one good looking track, but with low FPS and after one test I never try it again...