Just sharing this experience
As I was looking for some interesting places to fly, I used the slew mode and found an easy way to make evidence of memory leaks, that impacts also FPS
Note that in normal flight, I do not experience memory leaks
So here is what I did:
Start at an airport
I have my FPS, RAM and VRAM, GPU% counters on screen (I use the little Gamebar “Performances” window docked)
VRAM, RAM, GPU% and FPS values were all fine at the flight start
Then, I change to Slew mode (Y key) and start to fly at full speed (around 7400 kts) for a few instants (about 1000 NM) above some land
This way, the scenery could not load, because no sufficent time for it to load, so only a basic ground blurred sceney is displayed
Stop a few seconds sometimes to see how it gets
I noticed that:
- VRAM filled up and stays full, normally it stays around 2/3 used
- RAM (usually used at 50% of 32Gb) filled up and stayed full
- FPS downgraded to a few FPS, and stayed at a low value. Note that GPU% dropped to a low value also, in concordance with FPS drop
When RAM and VRAM got full, the scenery did not load anymore when stop at some place
Then I observed in the Windows resource monitor, that RAM is freed with a very very very slow rate, it needed more than 20 minutes to recover a lower value, that enabled again scenery loading at the place I stopped
But FPS stayed low, as well as GPU%, never recovered
I’m wondering whether scenery loading fail, due to not enough time to load it (because moving, or if the connectivity with servers is not fast enough) could be at the origin of memory leaks (that are way too slow to recover), and induce indirectly a constant FPS drop with no recovery
When I fly “normally”, the scenery gets loaded sufficiently fast enough, and I do not experience this situation. But with the Slew mode full speed, I forced the sim to fall into a non-nominal situation, where scenery does not have the time to be loaded, and brings it into an incorrect state where it does not recover
I remember having read posts stating scenery with very limited LOD, and FPS drops, may be this could also be linked to this kind of situation