I flew 75-minutes in VR (HP Reverb G2) at very low level up to 10,000 feet and did three landings and takeoffs from VBCorp airports in San Diego County. Using AutoFPS with a 30 FPS target I seldom saw less than 45 FPS and TOD > 200. I had high VR settings with ULTRA clouds. It was all just as I wanted. I was running Navigraph on a 2nd monitor and using it consistently.

The VRAM usage stayed at a consistent 10.9 GB with an additional 1.1GB shared in RAM. GPU utilization seldom exceeded 75%

RTX 4070S 12GB

Landed for a fourth time at KCRQ ILS28, taxied to the GA ramp and parked. This was my 2nd trip into KCRQ this session. Sitting on the ramp outside the BlkSq Baron Pro I could spin in a circle while maintaining 40 FPS.

I moved the mouse pointer to the 2nd monitor and clicked on the Navigraph KCRQ name to bring up an airport info chart. The in plane GTN 750 did show the chart but I wanted to see a bigger image.

When I clicked on the chart in the 2nd monitor - VRAM usage jumped up to 13.5GB with 5.5GB shared in RAM and GPU usage settled at a steady 99%. Frame rate dropped below 2/second.

I closed Navigraph and returned to the in cockpit view. The FPS stayed at 1 or 2 and VRAM stayed way over allocated. When I "ended flight" the VRAM usage stayed over committed and the GPU stayed at 99%.

Restarting the flight from the Main Menu resulted in the Baron sitting on the KCRQ GA ramp with VRAM still over committed and GPU at 99% with FPS<4.

This problem has been occurring randomly for the last week. Once VRAM is overcommitted the only way I can free it is to shut the sim session and then restart it.

Will VRAM usage ever be stabilized?

Google AI:

• Resizable BAR (ReBAR): On some systems, enabling ReBAR can cause MSFS to over‑preload assets, saturating VRAM and forcing more use of shared memory. Disabling ReBAR can free 500 MB–1.5 GB of VRAM, reducing stutters at heavy airports, especially on 12–16 GB cards

• High VRAM cards (24 GB+): If you have an RTX 4090 or similar, you can usually leave ReBAR on and shared memory enabled, as you’re less likely to hit VRAM limits

52 minutes ago, TacomaSailor said:

Will VRAM usage ever be stabilized?

Probably not, it's been a constant issue with this franchise since 2020s release and the recent rushed SU5 release saw major problems for RAM usage for Consoles (hence SU5.1 beta), it's seemingly one area (of many) that Asobo really struggle with. Which granted is a tough area to get right, the whole product is so massive and on 3 platforms + VR users it's gonna stress and collapse somewhere, but 6 years on and still VRAM issues and memory leaks? still issues for consoles? it's not great is it, either way all you can do is only what you can do for your system specs. It is tiring to continually adjust settings, you should not have to go into BIOS for a game these days and GPU drivers just stick to default settings and other than that cross your fingers.

Also as an aside you know you can use Navigraph in the Tablet in VR right? I'm not sure of the functionality between the tablet and the dedicated app on a monitor though, only recently subscribed myself :)

11 hours ago, Fielder said:

Google AI:

• Resizable BAR (ReBAR): On some systems, enabling ReBAR can cause MSFS to over‑preload assets, saturating VRAM and forcing more use of shared memory. Disabling ReBAR can free 500 MB–1.5 GB of VRAM, reducing stutters at heavy airports, especially on 12–16 GB cards

• High VRAM cards (24 GB+): If you have an RTX 4090 or similar, you can usually leave ReBAR on and shared memory enabled, as you’re less likely to hit VRAM limits

Who cares what goggle AI about. Reality check. Think for yourself.

For all of Asobo's attempts at improving VRAM issues and general performance (without affecting anything else), it seems beyond them.

Things looked quite promising and stable earlier in the year, then in SU4 they introduced the ridiculous object culling that gives you that stupid kludge of the delayed rendering every time you change views, and more scenery pop ups due to messing with the LOD settings.

I don't know any other sim that does this slow re-rendering between views, it appalling and looks like something going back to Commodore Amiga days.

We need 2K textures as an option.