Right, I've just tried the RaceRfactor and the SimRacingHub versions of Yas Marina and got the following results:
Settings: M, M, M, M, X16, M, M, O, L, M, H, H - PE=Low, AA=L3
RaceRfactor: Low=24 fps, High = 55 fps
SimRacingHub: Low = 56 fps, High = 60 fps
Settings: F, F, F, F, X16, F, Max, Q, H, H, U, H - PE=Low, AA=L3
RaceRfactor: Low=21 fps, High = 55 fps
SimRacingHub: Low = 50 fps, High = 60 fps
As above, but PE=None, AA=None
RaceRfactor: Low=21 fps, High = 52 fps
SimRacingHub: Low = 51 fps, High = 59 fps
My conclusion is that the SimRacingHub's Yas Marina is raceable on the maximal settings even on my GTX 1050 Ti, i5-660 (first generation) system (even with 12 AI cars as I had at the time), and that the RaceRfactor version is not raceable under any circumstances (on my system), and I've even tried low everything and it doesn't get any better.