Thanks - no other tracks I've tried seem affected though, and I've been testing quite a few with the last couple of CSP previews. A few more VR users at GTP have described the same symptoms with this track too. Is there anything out of the ordinary with the config? Especially the grass config?GutBomb, Mascot -- I've been able to reproduce your issues (both the laggy doom domes and the groove popping in and out) on CSP 0.1.62, using the free-look camera mode. However, reverting to CSP 0.1.46 (the "recommended" version in Content Manager) resolved the issues. I'll keep digging and see if I can resolve the problem, but I might just chalk this one up to a buggy CSP preview release.
One other thing I noticed (may not be related) is that the long line of flags on the s/f straight seem to 'pop' larger as you get close, so there's a ripple effect of the flags changing shape as you approach them. Flags have been a perennial problem with CSP previews though so it might just be buggy flags in 0.1.62.
Good luck with the bug hunting! It might be worth posting the config on the CSP discord and see if anyone spots anything unusual?