That's interesting indeed. If this is true I would really appreciate a setting to switch clouds intercation with wind off to get much better performance, this is especially true for people using lower end GPUs. For me personally having moving clouds is not that important, it's a cool feature but it comes at the cost of massive FPS loss I would like to turn it off.
We're learning that most performance issues seem to be tied to people running with very high anti-aliasing settings and/or very high resolutions. If you can knock down your AA settings a bit, you may find that you can re-enable overcast volumetric clouds.
After some testing, it appears I can run clouds on volumetric but not the overcast....might be a good compromise though.
Additonally, I set my Nvidia Control Panel settings for XP to default, changing only the "maximum power" setting. Seems to run the smoothest!
VR performance issues are probably driven by the same things causing performance issues on people using 4K monitors that we're seeing. Just too many pixels to render; at some point something pushes things over the edge. I'm going to spend some time today trying to understand what's going on under the hood better.
Thanks, I've toned down my settings a bit to some point where overall performance is less of an issue but still very much on the edge. It seems like from time to time I'll hit an edge case scenario that makes the performance go to trash, yet I can't point my finger to what's happening exactly. I've also found a way to capture my flights with the frametime info overlayed so hopefully I can catch some of these and send them to you for more constructive feedback.
I generally fly under Vulkan without issue. But in Vulkan, X-Plane has a unified depth buffer where the cockpit and the rest of the scene are all drawn together. Under OpenGL, they are drawn separately and we're able to draw out clouds in between the two... so it works a bit more reliably in this respect.
737ng can be flown without FMS and I did it a copule of years ago(Both FMS failure at an airport with no maintance cover). You just set the vspeed and N1 limit using the knobs instead. Regarding the RNAV, Airports should have contingency procedures in case an aircraft lose its rnav capability(eg:omnidirectional departure or radio aids to hold in case of radio failure). In Salzburg the airways bring you directly over the VOR and from there you can star your procedure.