firstly - what a beautiful track, great work.
second though - i had this on the old version and still on this one, the pit straight and the section from turns 3-6 i get a really bad frame rate drop.
i have tried lowering settings, no AI, different cars and times of day but it still happens, always at the same part of the track. i run at 60fps steady and then halfway round the last turn it drops by 10-12 frames, really noticeable when dropping out of 60fps. same again after the second turn, up to the rip it up bridge.
any ideas what might be causing this?