I did quite some practice and also tried to find the limits of my PC. Apparently the limit is somewhat at 20 cars grid without major stuttering and fps drops.
Therefore I am going to pull-out of this race. I thinks it is not going to make much fun this way and I would represent an danger to others.
But some day I'll be back!
If you did it with AI, it's entirely possible you're at the CPU limit, and you wouldn't necessarily reach that online AI takes a lot of processing power in AC.
I'll remove you if you want, but you're welcome to join us for practice after 8pm, where we should have most of the drivers out on track. If it's causing problems then, it should be pretty obvious