Update:
I finally got an opportunity to try flying in MSFS-2020/2024.
Frame rates and performance in 2024 were eventually returned to normal, but I noticed that visual detail inside the cockpit was a bit foggy.
(See the following post: https://forums.flightsimulator.com/t/fps-performance-vram-bug/668753/1415 for more details.)
It is important to note that more aggressive performance tweaking of the BIOS actually reduced the performance of MSFS-2024, whereas using less aggressive tweaks, (what I call the “low-hanging fruit”), turned out to work quite nicely.