I must share something I find a bit odd (but GOOD!)
I was fiddling around the settings and didn´t get good perfomance. (i7 7700k, 1080Ti, HTC Vive)
Then I tried editing the "hardware_settings_config_vr.xml". I changed the setting: <resolution width="1600" height="900"" to <resolution width="2048" height="1152".
It´s so smooth and sharp. Text is superclear. (Works in PCARS2 as well. PCARS2 was almost unplayable before i changed resolution.)
Don´t know why the higher resolution makes it more playable but I LIKE IT! Maybe some CPU-thingy with lower res?