FPS performance - VRAM bug?

Data point:
At Rio DeJanario in a Diamond DV-20 with video presets set to (mostly) high, Vsync set to “off”, ray tracing set to “off”, and the sliders set to 100/150 as preset by the game at initial startup:

Here is the current configuration list for my system:
https://forums.flightsimulator.com/t/what-ive-done-with-msfs-2024-so-far/689826/2

I replaced my motherboard due to a stupid mistake on my part that damaged the original MoBo and I tried some relatively aggressive tweaks.  The result was an unusable game as it stuttered very badly as if the frame-rate was essentially nil.  I returned to the MoBo settings, cleared everything to default, and set the usual “low-hanging fruit” settings I used on the prior MoBo.

  • Allow the system to access the full 16gb of my VRAM rather than only the first 256mb.

  • Set the ram timings to the XMP settings rather that the very conservative “default” settings.

  • Turn off the ability for things like PCI and RAM to “idle to sleep”.

  • Disabled virtualization, hyper-threading, and all hardware encryption.

  • Allowed automatic overclocking.

  • And maybe a couple of others I don’t remember.

The result of this was a much smoother game that had respectable frame-rates.


 
It should be noted that I have NOT tried any “tubeliners” as my flying skills aren’t sufficiently high to allow that.