Maybe this will be helpful to someone. I was experiencing crazy VR issues with only the CH-47F module. But I finally found a fix. Basically, all other modules would perform consistently around 45fps in VR. Roughly 100-120fps without VR. The Chinook performed well outside of VR, but in VR it would drop to only 3-5 fps. When I went back to another module...magically back to the usual roughly 45fps. Very frustrating!
First try was the log analyzer in Discord, but no luck. It showed everything was green and good to go. Tweaked settings to see if it would improve, but nothing helped. I stumbled upon a YT video from Spud Spike that solved this for me. The issue appears to be the efficiency cores in the Intel i9-14900 processor. Using the steps in the video to disable the E-cores brought the CH-47F VR up to roughly 45fps.
The change did not improve the performance of any other modules, just the Chinook. I think that means that the module, at least in its current state, just uses more CPU than the other modules. And, if you happen to have one of these processors with E-cores, they just can't handle the load. The work needs to be done on a P-core.
Anyway, I'm glad I was able to fix this, and maybe this will be helpful to others having VR performance issues with the CH-47F. If you have an Intel processor that uses E-cores, try disabling them when DCS is running.
Link: Spud Spike Video