CPU utilisation reduces dramatically after landing (~75% less than normal) killing FPS. Recovers in 2D, but reduces again when switching back to VR

Bug Reporting Hub Virtual Reality (VR)
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ISSUE DESCRIPTION

Description of the issue:

After landing, normally after two flights (but sometimes after just one), and usually whilst taxiing in and getting close to buildings, FPS in VR starts dropping from stable locked at 45FPS to around 15FPS, and doesn’t recover.

Checking resources usage, GPU utilisation remains consistent and doesn’t hit VRAM limits.

CPU usage however (specifically for the MSFS2024 process) drops from an average of around 30 - 40% in normal operation to around 10% when this issue occurs.

When exiting VR, CPU usage immediately jumps back up to the 30-40% range and FPS recovers in 2D mode. When attempting to re-enter VR, the CPU usage drops down again to around 10% and the FPS drops again with it.

At this point, the only way to recover in VR is to fully exit everything and restart.

FREQUENCY OF ISSUE

How often does this occur for you (Example: Just once, every time on sim load, intermittently)?

Every session, on landing, after one or sometimes multiple flights. Generally in demanding scenery on multi-leg airliner flights, but performance is normally very good right up until this happens.

REPRODUCTION STEPS

Please list clear steps you took in order to help our test team reproduce the same issue:

  1. Complete a full airliner flight in VR (Pimax Crystal Light) using non-default generated airports. It might take multiple legs.

  2. Check CPU usage during normal operation. Obviously depends on CPU but I normally get around 30-40% utilisation on an i5 13600KF.

  3. On taxi in, FPS slowly drops to around 15FPS and doesn’t recover.

  4. Check CPU usage, it will likely have dropped to around 10%

  5. Exit VR, check CPU utilisation. I should recover to around the value observed in step 2, and FPS should recover in 2D mode.

  6. Re-enter VR. CPU utilisation drops again to around 10% and FPS drops with it.

YOUR SETTINGS

If the issue still occurs with no mods and add-ons, please continue to report your issue. If not, please move this post to the User Support Hub.

What VR peripherals are you using: Pimax Crystal Light

[PC Only] Are you using Developer Mode or have you made any changes to it? No

[PC, MSFS 2020 Only] Are you using DX11 or DX12? N/A

[PC Only] What GPU (Graphics Card) do you use? RTX 4080 Super

[PC Only] What other relevant PC specs can you share? i5 13600KF, 64GB DDR5