I took a pass on beta two after reading the initial reports, but today held my breath and updated to beta three hoping for the best. I had downgraded my NVIDIA drivers to one that folks had reported as having better performance, and that caused me problems, but as soon as I updated to the most recent drivers everything worked great and was smooth as silk. Notably, upping the AA (HDR off) to 4x and even 8x isn’t having a significant hit on performance on my system, even sitting in SoCal, with ortho and full overcast (using VMI twick as a frame limiter, but with it set to 83% objects and 63% clouds). This gave me 24-25 FPS, running streaming software and a bunch of other things on the PC. Better yet, not a single stutter than I could notice. It’s very, very smooth.
Vulkan makes it a whole new day for X-Plane, even in beta. It’s a great, great improvement in the performance of the sim.