Long haul performance degradation back with SU12?

RTX 4090 here. Over water for 6 plus hours performance is fine with FPS hitting my set limit of 141fps with 4K Ultra settings. Over land for 2 plus hours and the fps drops by over a half with heavy stutters when panning.

This has been an ongoing issue since MSFS released, it was fixed somewhat with SU10, but has been back since SU11 or 12.

Its a highly annoying issue and one that will put me off from purchasing MSFS 2024 should it not be fixed for good in the upcoming Sim Update.

Asobo - fix this as soon as possible PLEASE!


I have completed two long hauls in the WT Boeings (14&12hrs) I am not seeing this degradation from a stutter perspective. I can’t comment on the FPS side of this as my FPS is locked at 62 and it stays there from take-off to landing but not seeing any new stutters throughout the flight. I also activate PSXT live traffic on take-off and arrival and I only load the departure and destination scenery in my community folder. I wonder if the locked frames makes a difference? I am running a 4090 with 12900k.

A lot of people are seeing the FPS drop on long haul flights and im seeing on flight no longer than 1hr45m flights. This really defeats my desire to fly since I cant fly anywhere and still be able to land without a slideshow. Ive also noticed woth the fps drop its also sort of an input lag which makes it very difficult to control my power on final. Im really hoping they fix this instead of just focusing efforts on FS2024.


The Steam Overlay got reworked recently. Whenever that happens, performance bugs seem to creep in…

So anyway. I had stuttering while panning the camera in conditions where none ought to be expected. (system just restarted, nothing running in the background, 80fps and over Sardinia, which is low fidelity right now) Deactivating the Steam overlay completely removed those.

Another thing I’ve noticed in the past where extreme photogrammetry related stutters that went away when manually downloading the scenery upfront.

I’ cant seem to edit my posting (yet? new here).
Anyway. Saw stutters again near ground. Not sure if it was the Steam Overlay after all. Possibly the slow internet connection.

Do you have the same issue if you follow the OP’s steps to reproduce it?

Yes, using the sim for longer than 4 hours results in a significant drop in frame rate. Regardless of airport or aircraft. I will start a flight at 60fps and barely maintain 20 by the time I land.

Provide extra information to complete the original description of the issue:

DX11, Ultra preset, terrain LOD 300, motion blur off. 3900x, 64gb RAM, 6900xt, 2tb NVME, wired gigabit internet.

If relevant, provide additional screenshots/video:

I unfortunately have to confirm this.

Just did a Long-Haul from Houston to Seattle with the Headwind, and on Approach the FPS went from 40 (Locked) down to 19-20 with worst Frames in the tens.

Of course the landings get much worse if you have no smooth gameplay and that somehow ruins the experience. Hope somebody knows a solution (Process lasso?)


Out of 16 cores (i9-11900k), only 4 cores (and only sporadically) are utilized - the rest are twiddling their thumbs. In-game, my RTX3080 runs at around 40% utilization, while in the main menu(!) it jumps to 80-90%, and voila, you get your 120 FPS@120 Hz. And believe me, I have already tested everything recommended in various forums. Forget about ‘Process lasso’ when the entire program code doesn’t do, what it should do.


Absolutely agree with you!

Nonetheless: there were “episodes” when longhaul flights without this degradation were possible.

How to get back to this? :grin:

MSFS2020 Long Haul flight from Houston to Seattle in Headwind A330neo / 4K HDR - YouTube here, just as an example, my flight from today…

you see how nice the FPS are in the beginning and during cruise, it think it started going downhill from minute 48 onwards…

So I kind of went desperate in trying everything I could to fix the issue. I removed my entire community folder and started a flight from Denver and went straight north from there to fly over as much land as possible. After about 2 hours I had zero stutter frames in the high to low 60s. After this I slowly kept adding 5-10 more addons and then tested another 2 hour flight even testing with some add on aircraft like the FBW A320. After I finally got through my entire folder of add ons put back into the folder and did a test flight I had zero stutter again. This was with all community add ons installed. After testing again with all plugins I did a normal flight and I think one my big issues with the stuttering was the traffic injection with FSLTL and FSHUD. When I didnt have FSHUD running it was fine. When I did the stutter came back.

Hope this can help somebody.

EDIT: Just cancelled my flight in FSHUD and my frames came back instantly. Maybe its less FSLTL and more FSHUD.

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My two cents to add more support to what is already a clearly evident issue.

Flew from EKCH - EFHK. 1 hour flight, performance on arrivial had my FPS into the low 20s.

Main thread on parking at the gate is 35-37ms. Reloaded into the same gate, same time, same everything and I was getting 30-32ms main thread timing. This is a pretty low level example. Longer flights result in much bigger differences.

7950X3D, 64GB 6000MHZ Cl30 RAM, 4090

I guess we just have to wait and see if Asobo can fix it. It certainly doesn’t bode well for the introduciton of more long haul aircraft…

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this doesn’t seem to affect aircraft that use default systems such as the working title 787 avionics, Been flying 10-13 hours without a single drop in fps.

I had this issue wth PMDG 737, Fenix A320 and Ini A310

but not with Kuro 787 or Default 787-10

wonder there coming no fix for this fps long flight problem


Update for A320 Fenix available. EDDF on ultra settings is now possible.

Hey everybody, have you thought to check your VRAM usage with the dev FPS monitor? I think that may be part of the issue. When I pulled into the gate after back to back legs in the Fenix A320, I noticed my performance was noticeably worse than when I started.

So, I opened the dev FPS monitor and noticed that my VRAM was totally maxed out (9gb/9gb usable on the RTX 3080). I restarted the sim and started up at the same gate and noticed my FPS was about 10 FPS higher, and that my VRAM usage was sitting at only 7.5/9gb.

Seems like some of this performance degradation may be due to VRAM getting maxed out after a certain amount of time


Not the case for me. Only sitting at 7 Gn out of 11.5 available. So plenty of headroom

I genuinely believe it has to do with server tbh. MSFS is the only sim directly connected to servers at literally ALL TIMES. You can’t run this sim without having an internet connection. What makes me think this? I’ve used XP9-12 and p3d v3 and v4 aside from
The odd crash I did 12, 14, and 16+ hour flights and not a single time did I experience performance degradation. All of those outside of updates where basically offline sims unless you used vatsim it whatever. Again this is my theory on it but it’s about the only theory that makes sense at this point.

MSFS can run in offline mode, you just won’t get the online services (including the delivery of photogrammetry and high-res texture data that’s not stored on your PC).

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You cannot run this sim without an internet connect. Yes there’s an “offline mode” but if you per say wanted to do a flight while say out on a family farm where connection just is near impossible you can’t even launch MSFS

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