Sorry for jumping in that late (missed this post) but let me just squeeze in a few things.
Parallel Projection is still required when running MSFS on any wide FOV headset (Pimax, Xtal, StarVR…) because of the frustum culling, and only Asobo can do something about it. They have it on their todo list so hopefully we will see a fix soon. Which is pretty simple, after all.
When running with Parallel Projection, the vertical and horizontal resolution is increased by around 30%, so to get the same performance as without PP, you need to decrease the resolution in SteamVR (from lets say 100% to 70% or so) to match the original resolution. If you dont, you will lose performance. And worst case, it may lead to crashes since the resolution is so high that your GPU cant handle it stable.
A hint for users running Pimax, especially the 8KX with native 4K resolution, to get increased sharpness and clarity in MSFS (while keeping same or even better performance):
- Use Small FOV for now, its still way wider than other headsets.
- Set PiTool render quality to 1.5 or higher.
- Keep SteamVR at 80% to 100% depending on the PiTool render quality you use. The SteamVR resolution should now be crazy high, like 6000x5000 or similar.
- Set in-game resolution to 50% or 60% so to.
This should give you a in-game resolution of around 3000 horizontal pixels. Sharp and crisp both in cockpit and outside, with very little shimmering/aliasing.