Came back to try this tonight after a few months of not playing it. Track optimisation varies pretty wildely, I had a steady 80fps + at Nordschleife with the same settings I've always been using, but then took it to Azure Coast and the track looks a complete mess (due to the shadows being messy/jaggy and so many shadows being cast), along with having almost unplayable framerates. To go from perfectly playable to barely playable from one track to the other is pretty disapointing, the track looks a lot different now and it's clear they have added a crapload of decorations to it, but they are gonna need to work hard to optimise that.
Also noticed some new camera/graphics stuff that I had to turn off, and a really long default FOV. After that I had it pretty sorted at Nords/Le Mans and got some playing done. Tried the Sauber C9 and it was pretty horrific in terms of physics, super sensitive with ice like grip, brakes that lock up too easily and a pretty floaty unresponsive yet twitchy mess of a handling model. So then I took out the Audi R18 and that was pretty decent, the gear changing up annoyed me though with the weird wobble on every single upshift.
Came accross a lot more bugs than I used to (autopilot is always on, even when it's off its on... and sometimes you have to turn it on to turn it off) and the interface is a pain in the ass to get into a race. Altogether pretty poor experience, the physics are pretty meh, graphical optimisation gone out the window on some tracks and bugs galore.