Monitor menu: G-sync compatibility turned on. 165Hz refresh.
nVidia Control Panel: Refresh rate set to 165Hz.
Riva Statistics Tuner: Frame rate capped at 90.
MSFS: Frame Sync On @ 50% monitor refresh.
That (plus all the other system tweaks) gives me a smooth 83 FPS/ 11.11ms latency in low-demand flights like a simple GA aircraft over a desert, and 40 FPS/ 20ms latency in high-demand scenarios like landing at KLAX.
RTX 3090 Ti
5800X3D