Eric
This sim usually prefers other settings in the GPU controls too. Like setting pre rendered frames to 1 for some reason. In theory it should run better with 2 or more.
I guess that the reason for that is that TS does not have config file (cfg) as other sims do eg FSX have so you have to set any instructions like PRF, vsync, etc. externally. However, some instructions may not work if set via NVidia CP (NVI), that will depend on how the NVCP/NVI interacts with TS2017 code, and at what point the instruction is used (if at all) by TS2017.
A lot of instructions set in NVCP or NVI may not actually work in TS2017, as far as I know there has been no universal compatibility bit found that allows NVI (and NVCP) to interact fully with TS2017 (back to TS2012).
Personally, I do not see any difference in quality, performance or lag using PRF 0 to 4 on 3 PC's - I accept that other systems may vary. Also GSync/freesync monitors bypass the need for pre-rendered frames.
Is this "1" setting just on your PC or is there a reference that this is a universal setting for TS2017?
Regards
pH