Hi…i would like to share a recent problem here and maybe some of you have the same issues.
I use a i9-10900k with 64GB RAM and a RTX 3090. The PC is only for MSFS and nothing else is running on it.
When i use Medium settings, turn off AI traffic and set the weather to preset to “Sky clear”, then i get around 30 FPS when i place the aircraft on the runway.
I can see on the FPS Counter “Limited my Main Thread”
Around 10 minutes later, i dont move the plane or change anything, my FPS drops to around15?!?!?!?!?
flying with weather is not possible: FPS 1-5!!!
What is going on here???
I have tried several tweakes from Youtube and the INternet but actualy there is not a real improvment
Any ideas? Someone got the same issues???
Thx a lot and stay healthy
Klaus
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Only way to stop the dramatic FPS drop is to turn the whole ONLINE FUNCTIONALITY: OFF
I remember Asobo / Microsoft did a server boot last week, could this be the reason…
I have the same problem. 60fps and suddenly drops to 15fps. It since world update 3. Live traffic and multiplayer off.
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Yes getting the drops as well since the last update.
Check your temps
If your case cooking is not good then maybe the Cpu &/or Gpu is throttling down
With that hardware you should be getting FPS of 50-60 in 4K High settings in more remote areas and 35-45 in cities. If your temps are ok (less than say 85c) then it’s not likely thermal throttle and something is not right in settings somewhere. Have you ever had better performance before a recent MSFS update or has it always been this bad? Turn off multiplayer, turn off live weather, turn off live traffic. Check NVidia driver for an update. Some folks use an older driver (457.3 I think?), but I have a nearly identical setup to you and am running the latest NVidia driver no problem. You could try deleting the rolling cache and let it rebuild. Turn off game mode in windows, make sure the Xbox settings to record your video are off (they are in the same place as the game mode settings). Check the NVidia control panel settings and maybe set them back to default and then toggle to those recommended on the forum here. Post back if you need help and I can link some other posts that show that stuff. And after changing settings in windows, NVidia and MSFS, I tend to shut down and reboot the machine as well. A last ditch effort could be to uninstall and re-download the entire game but that’s such a pain that maybe hold off on that .
Thank you very much Sir for your reply!
I actually have done your recommended settings already. Have the latest drive and the watercooling is doing a great job on my CPU.
Even the GPU is not getting that hot, the fan don’t even go on full speed.
Today I tried different settings and mad a flight with no weather and no AI traffic.
I started in Vienna with 70FPs and around one hour flight time I had 10 to 13 FPS
The FPS is steady going down without any recovery.
Usually when the scenery is getting less intense you can see a recovery and FPS.
There is no improvement…
If I check I can see that one CPU core is always at 100% while the other ones have lots of space for a workload.
I guess it is a software issue… I don’t know how it was before world update 3.
Maybe MSFS is not yet much adjusted to mulit core usage.
Hope that will change…
Anyways… Thank you all guys for the response…
Stay safe… Stay healthy…
Klaus
LOWW
Yes, the general consensus is that 457.30 is the best for FS2020 and FS2020 VR. It will likely remain that way until Nvidia comes out with drivers that are specifically designed for FS2020 and/or FS2020 VR tunings in mind, though sometimes they don’t necessarily label them as such.
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Thank you Sir… I will download this particular driver and give it a test.
Temperatures - give them a check
Nvidia Drivers - did you update recently
Nvidia Geforce Experience - make sure its Optimization is OFF
Render Scaling, in MSFS’ Graphics Settings - somehow mine got turned to 200 - slowed my PC WAY down (R9 3900X, 2080Ti, 64GB RAM, Nvme drives only)
Also had issues with the FPS settings in Graphics - temp turned them down from 60FPS and forgot to turn them back up 
Maybe some of that might help - I hope so and wish you luck.
Well I was having serious frame drops, with the “main thread limit” after a few minutes of play. Anywhere from 6-15 minutes in. I tried all the stuff in this thread to no avail. Then I uninstalled the MSI dragon center (my laptop is an MSI gaming laptop) and the problem seems to have gone away so far (a few flights of over 30 minutes now, with good framerate throughout)
HAD THE SAME SAME PROBLEM TOO, Any solutions found please?
I am having the exact issue in game play. About a month ago, I was able to play the game with ULTRA settings and having 75 FPS without any stuttering or FPS dropping. During the complete flight it was steady and all graphic settings were at maximum. My system has Ryzen 9 5900x cpu, 32 gb 3200 mhz ram, RTX 3080 10 Gb graphics card. With same computer now I only gain 15-20 FPS and game acts abnormally. While turning the view with the mouse, game crashes, stuttering happens, screen hangs and too many problems. There are other games that I play with same computer and none of them have the same issue ! Both games play at ultra settings with minimum 75 FPS as my monitor has a 75 Hz refresh rate and there is no need to have more FPS while the monitor does not support it. So I put a limit to FPS 75. The problem looks like a software issue and it happened after the last mandatory update. Asobo asked me to send several files from my computer to see what causes these problems. Yet they did not give me an answer but once I got info, I will share here…
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Same here, something happened and now I’ve gone from high settings 60fps to 1-0 fps. Not kidding, and I’ve searched the web and no solution. Super frustrating. Please share if you get any valuable information.
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I am having the same issue. I was flying with above 30 fps and now after 5 minutes of flying on the simulator the framerates drop to less than 20.
We need help with this issue.
RTX 3090
5900X
64GB Ram
I mailed several times to Asobo to ask the reason and the only answer I received is "We are searching "! Searching but is it so difficult to find a solution? New Graphic Card series RTX 4000 will come up by the end of this year. May be they are making adjustments to graphic settings so that we can buy new cards ! I just bought RTX 3080 which was playing the game above 75 fps and now about 30-35 ! Isn’t it strange?
I am having the same issue since SU9. I have my frame rate locked at 30fps. First FPS degradation occurs after ±1 hour of flight (±26fps). 1h30 in flight it is half (±15fps).
Made a first longer flight yesterday + 3h and noticed that recovery of the frame rate happens over water. When flying back over land frame rates cave in again. (flights with MD82 above FL300). It is independant of your viewpoint.
After so many attempts, nothing changed on FPS ! Still very low and the game has poor performance even with high end system. The only thing I can say is the problem is related to a software issue. They are purposely doing this to cause gamers buy new systems or vga cards ! I am waiting for xplane new version. This FS sucks!