I don't think anyone in build thread has reported FPS increase, also nothing in build notes about performance. I think there are too many variables and settings combinations to be sure there was any change. To construct two test scenarios one needs to run both builds at exact same time of day, exact same amount of AI on track, GPU settings, etc.
Set pre-rendered frames to 1. Better CPU usage which may lead to higher framerates, and decreased input lag. Pre-rendered frames should be set to "1" for all racing sims where minimum input lag is crucial.