I was a little overzealous with the optimizations and it was causing some shadow and tree pop-in. I have fixed that and performance should be the same but it the pop-in should be gone. Also updated the sections file thanks to @Fanapryde and also made the runoff area for the chicane invalid track so you can't cheat anymore.
I got reports that the performance was still not what it should be, so I made some changes that should have minimal visual impact but should improve the frame rate some more.