I did this...
And this... (well not exactly, I verified the cache and two files downloaded)
And this...
And the problem has gone! I'm now running 1.5 SS in SteamVR, AA at level 5 in rF2, with 20 cars on the grid at Silverstone and my GPU is humming along at 65% (plenty of room for particles fx) and with a solid 90fps. Thank you all for the suggestions. I'm not sure which one helped, but something did!
Oh Man!...thanks so much, I've been messing with this sooo much and Depco's "right click on the executable and then going to properties, compatibility, and then check "disable full-screen optimizations. I did this to both my steam.exe and rF2.exe." solution worked for me. I did it just to the rFactor2.exe and it worked! buttery smooth now! Now i can spend some time with the kids
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