How to improve rFactor 2 using HTC Vive?

Last night I participated inthe 80 minutes of Nordschleife. I had lots of problems with the performance during the entire race.
I'm using 1080ti, i7 8700, 16 GB and all graphics in medium, level 5 of antialiasing and the rest of parameters off or low.
When I practice alone, the game runs fine but yesterday, with 35 cars in the grid, the performance was horrible.

Any tricks to improve it?
 
After a few tests, I reduced the antialiasing to level 2 and the anisotropic filter to 8x and the fps came back like sheep to their flock.

It's curious how the downgrade from level 5 to level 2 of antialiasing doesn't change the visuals too much (it changes obviosly but it seems to be more difference between none to level 2 than level 2 to 5) but the performance is radically better.
 
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