Ahaha it's Xmas windscreen, it's not a trouble, but a feature

Jokes apart, just made a stress test of the new build.
I have a R9.280X toxic (that is a OC version).
Well, took 20 McLaren to silverstone, put them under a heavy rain, just to see those astounding reflections a droplets.
For starter : the visual impact is AWESOME, while I know that from the physics standpoint nothing is yet changed, it's a great improvement in immersion.
Performance wise yes, those awesome visual effects come to a cost, and while with little traffic on the dry I have around 90 fps stable (capped in player.json), at racestart with 19 AI under heavy rain at silverstone I have 45, then during race I was around 55/60 when I was far from the group. In my opinion, while the FPS drop is quite consistent, I could not expect that all that eyecandy come at no cost at all. RF2 is still smooth and playable even with not awesome FPS, and I'm sure that reducing a bit of reflections, an with a bit less details here and there, the drop could be contained and the visual impact could still be good enough. It's a matter of finding a personal taste preference, and it's a good things that so many parameters could be tweaked in control panel.
I personally think that I will start to introduce a little chance of rain in my offline racing weekend, even if there are still some thing to improve AI wise. I think now, more than ever, there is need of some "AI manager" that is able to dictate tire stragegy and pitstops for quali and race and that supervision single pilot decisions. Now If I want to make a quick race, and rain happen at race start, or immediately after, almost all AI will pit at the first lap, instead of starting race with the appropriate tires.