I noticed a heavy FPS issue at Cascais / Estoril, especially when driving into north direction (against chicane). I started a race weekend with the P1 cars but, independing from weather, it wasn't able to drive. There was such stocking and a lost of FPS that it was difficult to keep the car on track. Later I tested it with Formula Retro, sunny day and in testing (only me on track) there was also a lost of FPS and stocking. Not so much but feelable. Do you have the same issues?
I'm definitely getting a severe loss of FPS as well, though mostly (only?) in replays. Have been doing test runs and single races on this track these past couple days and the trackside replay cameras definitely cause a significant drop in FPS. Haven't checked but it feels like I'm at or around 60 most of the time, probably drops down to half of that on these occasions; though it seems more stuttering than low FPS. If I had to guess I'd say there are still missing LODs for this track, hence the slowdowns when a lot of trackside objects are visible.
Yes, I also think missing LODs could cause the issue. Mainly the issue occurs between turn 2 and 3, is better between turn 3 and 4 and gets worse after turn 4. So, always when the whole track with all objects and so on is in front of you and has to be displayed. I.e. at Bathurst, which is much more a bigger track with more objects, I don't have this issue.