FPS performance - VRAM bug?

Dear Devs, this is amazing! Crazy Vram savings with new D3D12 Sampler Feedback https://www.youtube.com/watch?v=NfgJJbtfjs8

Please i beg you all Devs, this really can help MSFS2024 a lot, no visible visual degradation, some great amount of Vram saving. Have a lovely positive day you all.

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So which one of you will solve your issue by picking up the new RTX Pro 6000. 96 GB of DDR7 VRAM ought to do it :slight_smile:

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What do you mean Windows Cache? The pagefile/virtual memory?

What’s the source for 20 or 21 March?

They said it on the Stream last friday. (with a lot of “maybe”)

Yes that’s what I meant.

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You’re a customer, you don’t have to beg. Lol. Let’s see how the SU2 tackles this issue… “Maybe”.

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Hi fellow 3070ti sufferer… newsflash: medium is high for the 3070ti on many settings. I run at 32 FPS but I turned everything down to the lowest settings first… everything. You should get 50+ FPS… if not then there is something else wrong with your system.

If you get the 50FPS congrats and then add in settings complexity one by one. Stay away from: Ray Traced Shadows; Clouds; Buildings; and all the terrains stuff and keep texture resolution low.

This is how you debug a bad service in windows… turn all off and add back slowly.

I will get a 5080 after my birthday in June…

PS The aircraft/airport makes a difference… start with the C-172 at a simple airport. Smallish VRAM use.

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can’t wait to try

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I love, love the graph! I am surprised by trees being the second-biggest hit on performance followed by terrain shadows. I suspected Object LOD on second rank. However, I am not sure if for a performance test a 3060Ti is the optimal choice. Of course if that card is on its limit you won’t see any changes upwards, I suppose.

The trouble with VRAM in FS2024 is not only when you reach maximum capacity. Well before that, the VRAM memory management (presumably) kicks in to ensure the VRAM is not overloaded, and it is likely this that affects fps.

I have a gtx1080TI, with 11Gb VRAM. I’m in VR and running on pretty low graphics settings. After flights, I review the fps and VRAM usage in Afterburner, which allows me to exactly correlate the two over the last flight or beyond.

  • If the VRAM usage is below 7GB, I generally get 30-35 fps. Not good, but fairly comfortable.
  • If the VRAM usage is 7 to 8 GB (still 3Gb below the installed VRAM), the fps drops to 25 - 30fps. Still usable, but noticeably worse.
  • if the VRAM usage is 8 to 9Gb, fps drops to 20 to 25 and I start to get continuous micro-stutters. Rather unpleasant, despite being >2Gb below the max VRAM.
  • If the VRAM usage is above 9Gb, fps is in the teens, it’s really unflyable and I generally give up.

These results do vary a bit with aircraft/location, but are fairly reproducible.

In FS2020 (on DX11), my fps is about 10 higher across the board, and always more pleasant to fly.

It’s not only high Vram use that causes stutters.
When i have almost 11 GB Vram use my fps can be stable and smooth (RTX 4070 Super).

Sometimes i have big stutters when my Vram is < 10 GB and on some airports the stutters start and stays whatever i do. Lowering settings don’t do anything, only a restart will help then.

There are some places on earth where Vram go’s sky high and then fps drops to one figure, but most of the time Vram stays below 11 GB.

As I said in my post, it varies a bit between aircraft/location (C172 is particularly bad because of the propeller simulation), but my results generally hold - as the VRAM usage goes up (even if well within the maximum) the performance goes down. The degree of stuttering will of course be affected by speed, altitude above ground, degree of banking/turning, etc, so I’ve also allowed for that in my analysis.

Sometimes I can reproduce the VRAM anomaly by switching anti aliasing mode, or general setting (from low end, medium, to high end). Right after getting back to the sim, the FPS drops and never recovers until restarting.

However, it occurs more often with non FS2024 aircraft than the stock ones (i.e, Lama 315 vs R66).

So, any news on SU2 Beta?

Theoretically, changing this preset should always trigger a warning that you must restart the sim for this to take affect as this preset involves changing Texture Resolution, which does not fully change without a restart.

Yes true, if it touches the Texture Resolution. However, I just reinstalled 2024 today, and did the same thing with the sliders even more abusively. Weirdly enough the fps was stable.

I run out of VRAM flying over Rio de Janeiro after the world update sadly. I have to lower TLOD and OLOD drastically to be able to fly over there. I suppose they didn’t optimize it while we were waiting for it to release :man_shrugging:
I’m betting it is the handcrafted airports there that are the culprit once again. There are a few areas like that.

I think that applies mostly in areas where the trees are dense. When I fly over dense areas my PC fans spin up.

Maybe today. Probably tomorrow if they didn’t run into any obstacles.