28 FPS at Spa, 60 everywhere else with GeForce RTX 4090 in FM 2023

I have a recent system with a GeForce RTX 4090. The game chose Ultra graphics settings at install. Every track I’ve been to so far has rendered at 60 FPS (as shown by Steam FPS counter), but for some reason Spa is below 30.

Anyone else see this?

Different set up (PC, RTX3080), but same issue.

I experience significant frame drops on Spa. Like, way significant. Like, down to 0 fps when loading up sometimes. I have some drop on other tracks too, but Spa is the worst.