Yesterday i looked at my FPS using Fraps. I got exactly 30FPS in ultra graphics mode, exactly 60 FPS in high mode (Richmond Course). The FPS do not change over time, they are nearly constant. so it seems like there is some kind of FPS-limiter built in? Remark: VSync is turned off in the Nvidia settings. I think zwift could also run at much higher FPS on my setup (GTX 960 OC, i7 3770K @ 4,4 GHz, 8GB Ram).
How to turn of this limiter? ;)
Greetings from Austria!