This is the most important sentence. On each PC, you can have a vastly different experience because its so hard to optimize a game for millions of different hardware combinations. I m losing only about 10-15 fps on my laptop at the start of a race in pcars and I m stilll in the 50s, yet I cant for for the life of me bring rfactor 2 to run at more than 20 fps.
Optimization is so much easier on consoles, as they are closed environments with fix hardware. I would be very surprised if pcars dips under 45 fps on PS4/XBone, even with the biggest possible starting fields.