FPS drop when panning camera views in MSFS 2024, DLSS 4.5 Stutter

Bug Reporting Hub Install, Performance & Graphics
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This a 2024 BUG, similar to 2020 bug report.

DLSS 4.5
Preset M, L both start off butter smooth but after 20 or 30 seconds it becomes stutter.

TenPatrol Gave me this explanation. Credit to him. (link to this post is found below in TenPatrol Response.)
“Smooth at first because textures are cached only for about 20 seconds. After that, they are removed from memory, which is why stuttering appears when rotating the camera. This was done intentionally and they are supposed to fix it.”

FREQUENCY OF ISSUE
All the time.

REPRODUCTION STEPS
Start a flight or simply change from ultra to performance. Will be smooth for about 20 seconds and then it stutters.

YOUR SETTINGS
I find it makes no difference where I am, on the ground in the air and or simply changing from ULTRA-performance to performance in the air-- the same result. Very smooth (Its so perfect BUTTER SMOOTH) then after 20 sec and we know the rest, I thought I might include this info.
Video Driver V 591.74
Samsung G9 57 inch, 5120x1440@240hz
RTX5090

Cheers
PACO572

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Providing the GPU driver version might be helpful.

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If you’re going to copy my posts word-for-word, the least you could do is credit the author and link to the source. It’s really not classy to take someone’s words and pretend they’re your own.

Here’s my original post and the source link:

Source https://forums.flightsimulator.com/t/stutter-fps-drop-when-panning-camera-views/477872/264?u=tenpatrol

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I do apologise.
My Bad.

PACO572

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This problem appears not only with DLSS. Its a global SU4 Problem with the mainthread and the textures beeing only saved for 20 Seconds into the Cache… no matter what graphic settings. The intensivity of the Problem can vary from location to location. Switzerland is Horror stutter while UK is pretty good for example. Also the Problem seems to be not related with the level of scenery complexity. Big photogrammetry cities can run well while some countryside landscapes stutter like hell while panning the camera after 20 Seconds.

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I have resolved the issue at least on my end. See my last post.
RTX 5090
Samsung G9 57inch 5120x1440@ 240hz

PACO572

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The problem ist always present in different intensity levels … maybe just try to make a flight in the UK where the stuttering is really limited… and then Switzerland… Bern where ist horrible … but ofc it can be that this is different from user to user.

Fact is that there is a massive cache/mainthread problem with SU4 that needs to be solved as it ruins the experience.

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Another issue, we have to wait months for this to be fixed, which I think is un acceptable.

PACO572

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I don’t want to believe they’re going to take that long. We all agree it’s urgent; it’s way too harmful for those of us who love flying. I’m going crazy commenting everywhere I can, even on the official MSFS Instagram, just to find out when SU5 is coming. :smiling_face_with_tear:

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You have got a 5090… i have got a 9800x3D and 5080… our hardware is for 100% NOT the problem.

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Hey,

if you are using Steam, try to empty the Steam Shader Cache and disable precompiled Shaders in the Steam General Settings. Stutter while Panning was a known problem for me since msfs2020 and after i done that with MFS Cleaner / Fixer ✈️ MFS Cleaner / Fixer für Microsoft Flight Simulator | MSFS and the Steam Settings, its the first time ever there are barely any stutters when panning the camera.

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I’ve recently found that optimizing RAM subtimings can have have a really substantial effect on eliminating stutters, especially those “semi-periodic” ones (every 1-2 seconds) most noticeable when panning. It really requires putting some time into it (at least if you’re new to it like me) but I highly recommend it, especially for VR, where every ms seems to matter.

After tightening both my primary and secondary timings iteratively I’m having the smoothest experience I’ve ever had. It was a frustrating and long-winded experience, but also very rewarding when things start working out.

There can of course be lots of different reasons for stutters, but in my case tightening the timings gave it that final nudge it needed to run flawlessly at 75fps locked and super-consistent frametimes. Although some PG areas are still problematic, but that seems to be primarily a GPU issue (even on a 5090).

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Hardware definitely seems to play a role. It seems that on very fast DDR5 systems, the VRAM is filled so quickly, that the stutters are not as disruptive as on slower hardware. To me, this rather looks like a limitation on the CPU, resp. system memory bandwith side though, rather then an issue of the GPU.

Also, the purging is more pronaunced the higher the VRAM utilizaion is. On moderate graphics settings, or scarse scenery, if VRAM sits around 7-9 GB, only few hundred MB are being purged, and recaching manifests itself in a mere short framespike, still annoying, but not dealbraking.
Loading up an Airliner at some busy airport, with VRAM in the 15-17GB region, the purging is more agressiv, I’ve monitored roughly 1-2GB, and recaching is a 1-2s stutterfest. Noteable, a 1-2s stutterfest that repeats itself each and every time, I pan my view around.

So in a way, those of us who are running the sim at very high graphics setting due to powerful GPUs with 16GB or more VRAM are suffering the most.

What bothers me, is that this whole VRAM purging, the way it is now, seems to have been coded into SU4 deliberately, most probably in an effort to make MSFS2024 run well on PS5.
Additionally, on consoles, the panning is usually done with the controller, so in a much slower and controlled fashion, compared to panning around with the mouse as you do on PC. From
developement side, this might have even looked like a proper solution to work around hardware limitations.

Also really looking forward to SU5 beta now, and not giving up hope, that this will indeed be addressed soon.

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I don’t know if it is related, but with a few tests, on my side, uninstalling optiscaler seems to help with fluidity when panning a view.

I realised it when i installed optiscaler mod last week, and those stutters appeared very strongly.

It maybe just on my side, i don’t know.

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I fixed it for me with disabling Fauna and Ship Traffic. Without: Fiber Time 0,08ms Average, with one of them enabled Fiber Time 2,5ms / 3ms Fiber Timer - so every fast movement will spike the fiber time and lead to the Tiles from TLOD being marked as “Failed”. Therefore you will need to redownload those tiles no matter if they were in the rolling cache → You will see a network spike (instead of a gpu or cpu spike) and thats what the “Stutter” is waiting for.

Edit: this definetly is an issue that will cause stutters, but seems mine are not fully fixed yet

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The reason I am reading this post is because I made a video (so slow panning and lots of head movement) and was shocked at how bad the stutters were. I cleared caches, restarted machine…..still there….and where was I?….Switzerland! Loaded in the UK and was normal smoothness…..back to Switzerland and it was a stutter fest!

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The problem is definitely related to the world areas you fly in. I dont have any bad stutters in Sao Paulo or Tokyo which are by far the biggest PG areas of the Sim. But when i fly in switzerland i also have a stutterfest. It has nothing to do with air and sea traffic. Every cache clearing, disabling ReBar etc. has no effect on the problem.

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Yeah the German-speaking part of Europe (probably amongst others) largely has terribly-performing PG for some reason.

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not only PG… landscapes without PG stutter too.

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SU5 beta - stutter on pan still occurs, but it seems like texture unloading timeout was increased from 20s to 60-65s.

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