nah… after the 4th hour it’s still there. I quit.
2 Likes
I just had the same problem.
I started the flight with the Salty 747 yesterday at 9 pm (German time) and wanted to continue the flight today, the sim had only 15 frames and I could not fix that. I turned the traffic off and on, disabled the online function, but the frames stayed the same. I have closed the simulator.
I used the top of descent calculator tool from flightsim.to for autopause.
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Same here. 45 at start after a time 10. Very frustrating.
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Right …a wee update I’m flying for 2 hours now without any issues after the latest patch. I did the following (both at the same time so I don’t know which bit did the trick! I know I would be a terrible beta tester). After the patch, I can now see the “off-screen terain pre-caching” option for VR (I’m using VR). I have set this to ULTRA and since then I have had smooth consistent flight (stable fps with no degradation). I have also gone to the flightsimolator.exe properties and I disabled the “full-screen optimisation” in the compatibility tab. I’m currently in a 747 flight using Salty mod crossing the pond and so far there’s no performance drop at all! I will update the post if anything changes (hopefully not 
)
EDIT: Nope…Almost 5 hours into the flight now and the degradation has begun. From 40 I’m now down to 13 FPS. CPU usage is down to 26% and GPU is at 36%!!! Wow
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I had the same issue (more details below) and I think I found a solution, or rather workaround, that works for me:
- When this happens go to the graphics settings (without ending the flight).
- Change from FULL SCREEN to WINDOWED, apply.
- Minimize the window.
- Restore and go back to FULL SCREEN, apply.
- Resume the flight - the performance should slowly return within a couple of minutes.
My specs: Ryzen 7 3800XT, 32GB RAM, 2080 SUPER, SSD
Sim settings: Almost everything Ultra, rendering 100, 2560x1440
The scenario is long flights where I don’t touch the sim for awhile. That indicates to me it might be some kind of optimization, but I’m still struggling to figure how to disable it. The solution above seems to “refresh” it somehow. I did twick some GeForce settings based on others’ suggestions, might be relevant:
- In GeForce control panel, go to Manage 3D settings - Program settings.
- Select Microsoft Flight Simulator.
- Power management mode: Maximum performance
- Texture filtering - Anisotropic sample optimization: On
- Texture filtering - Quality: High performance
- Texture filtering - Trilinear optimization: On
3 Likes
With 1.19.8.0, I tried a 10 hour flight with the C208B and it seemed that the FPS drop and audio crackling at the end (on descent) was not as severe as before. This was with AI/Live traffic off and a clear weather preset. The only setting difference was the new Terrain pre-caching slider to Ultra.
With 1.19.9.0, I did ~12 hour overnight flight with the C208B (unlimited fuel) from KHVN to LPLA.
This time I defied conventional wisdom and had Live Traffic on, Live Weather on and Live Player on.
Maybe I was lucky but there was no FPS drops or audio crackling, even on descent, hold and approach to an ILS landing, taxi and shutdown.
I will test with a previous flight plan that had drops/crackles.
Talking about my experience, fps problem goes away when I flush AI traffic. Just saying to highlight this flight was a transatlantic one landing on a less busy airport. My FPS drops 50% faster when I pass many AI planes on busy routes and flying over crowded airports.
I have only fullscreen as an option. No windowed mode to choose
@NFGoose On PC? That’s odd… But generally speaking, the reason I even tried it is to change something drastic to overcome what seems like a “state” the graphics card went into, by for example temporarily hiding the sim window. The next guess would be resolution - try changing it back and forth.
@btdc00 To my understanding this is a different issue, unrelated to traffic, weather or busy airports, but rather random (and huge) FPS drops in the middle of very long flights.
I tested your suggestion in GeForce Experience, it works better than before this settings.
RTX 2060, 16gb 3000MHZ, AMD Ryzen 5 2600.
FPS dropped to 25-30 from 40-50 (no to 10fps).
GPU Usage dropped from 50% to 35-40% (no to 20% usage).
Also your idea for fullscreen/windowed option works, thanks a lot 
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I still think clouds are the problem…
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I also had a 2 1/2 hour flight without drop.
But I didn’t change anything.
So I’m more and more convinced that it is a server side problem
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Second flight 1 1/2 hours into the flight, no drop so far. No change regarding settings.
Last two flights i used an VPN, don’t know if it is making any difference
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I have tested to turn off the AI traffic.
Turn off real time AI bring back 30 fps immediately.
Then i turn on it again - and the frames are stable back to 60. Maybe i have to repeat after a while.
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I can confirm that nothing has changed for me since the patch. FPS loss around 8.5 hours into flight, drops to around 10 FPS. Live weather, traffic both turned off. Using 787 Heavy. Hotfix Hotfix Hotfix immediately.
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For me exactly the same msfs sucks, I regret I bought it
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I did two long flights here and the FPS didn’t change; and it’s the same places I’ve had problems before.The settings are the same. 
I just had crazy stuttering descending into EGLL today. Yesterday and the day before, it was smoother. I can’t tell if it’s server issues or a bug. I stopped bothering and closed the sim. They seriously need to fix this sim. It’s a massive waste of time playing like this. I reported something about dropping FPS to ZenDesk, they replied saying it was apparently fixed after WU6 and immediately closed the report as “solved”. Laughable, I know. I am seriously considering moving back to FSX with stable 30 FPS because it was well, more stable than MSFS.
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Agree, yesterday sim was smoother. Today it is inasne.
What I think is AI traffic (even when they’re not visible anymore) remains tracked in the app and by the time consumes more and more resources. People above mentioned when turning off/on only the AI traffic the fps jumps back (as the traffic “database” had to build up again from scratch and no more dead branches), like @EinhornAlex1981 reported lastly and I do every single day without failure and that’s why can still use the sim. This is what I tried to say, you may haven’t met many AI traffic over the ocean and it wasn’t necessary a luck.
What I thinking about, what else causing this bug as reportedly also occurring when traffic is off, but not affecting those who can restore FPS with a simple ai traffic switch.