I’d like to add a couple of links to another thread that I feel might be quite useful here. Hopefully, these will help some to control/eliminate their stuttering and jittery MSFS performance.
1.) The first concerns establishing a cleaner baseline PC environment from which to troubleshoot:
https://forums.flightsimulator.com/t/crash-to-desktop-without-error-message/130085/3129?u=tallestparsley2
2.) The second describes my own experience from allowing FPS to basically run amok in MSFS and how to control that: https://forums.flightsimulator.com/t/crash-to-desktop-without-error-message/130085/3152?u=tallestparsley2