I’ve been pulling my hair out as I’ve recently started to have periods of bad stuttering whilst keeping consistent 60fps. I’ve tried to reinstall drivers, clearing out cache and even done a reinstall of MSFS. I’m using latest Nvidia drivers, running 13900k and RTX4090 with DX12 and FG on.

The stutters seem to come on quite randomly and seem related to increased GPU usage - I’m using RivaTuner to monitor GPU usage where I can clearly see it go up from say 45% to 60-65% (but not a single drop in FPS, staying pegged at 60FPS). More notably, I can see consistent yellow spikes in GPU timings if I am in developer mode and have the FPS on in screen. When I don’t see these spikes, panning is supper smooth (and no GPU spikes at all), but with these spikes the stuttering is awful - especially since I’m using Tobii eye tracker to look around. 

I seem to be able to get rid of the stutters by going into the settings menu, click around and then resume the game, but will then randomly come back. The stutters also seem to come and go when I go between MSFS and other applications - if there’s stutters and make FS inactive and back active again sometimes resolves it, but in other cases if I don’t have the stutters and to to another application (say by going into active sky or web browser) this could induce the GPU spikes when I return to MSFS.
 

Just can’t seem to figure out what’s triggering it, any ideas would be most appreciated. 
 

As an update, issue seems to be completely related to frame generation. Without FG I am not getting these GPU spikes. Any ideas would be most welcome.

Did you by chance ever try to update your DLSS files for both normal DLSS and frame generation DLSS? 

Yes I have, makes no difference unfortunately. Tried now both the stock ones that comes with MSFS and the latest 3.7 versions. 

Strange. Do you use any kind of cache in your sim? Did you delete the shader cache folder recently? What shader cache size did you set in NCP?

You are not alone. I am getting the same issues recently with a 3090 and an Intel 12900k. Temps look fine on both the CPU and GPU, so it doesn't appear to be throttling because of high temps. It just randomly spike loads the GPU and I start getting these massive stop/start stutters. I'm going to try and delete my NVIDIA cache and see what shakes out, although I am not hopeful. I don't run a rolling cache in MSFS. If I find any sort of an answer, I'll drop it in here. 

On 5/6/2024 at 10:52 AM, AnkH said:

Did you by chance ever try to update your DLSS files for both normal DLSS and frame generation DLSS? 

There are two DLSS files? I updated "one" (to 3.7.0) and I don't like Frame Generation. Maybe I should have updated another file?

PS: I folow this guide:

 

Edited May 20, 20242 yr by Juliett Alfa Romeo