Also check if all CPU Cores are still activated in the Windows configuration. Apparrently one of the regular Windows Updates switched it to only one core which caused heavy stutters in graphics and audio. I struggled one week with MSFS until I found this solution somewhere, didn’t expect that !
How did it do that, and what did you do to undo it?
I’ve never had that either, though I am going to check all the same. I think I would have noticed by now if it had. 
I thank you for your help and assistance with this issue. I will be trying this proposed solution next week. My frustration is not with the community its with the game devs themselves. We as a community should not be required to use a 3rd party as a fix for this issue. The game developers should address this issue front and center and propose a solution that resolves the issue without players using 3rd party software.
If this proposed fix does work i will update you and i thank you for this possible solution but ultimately this issue should be addressed and patched by the developers themselves.
That’s right, too little RAM is being used. When too much RAM is used, some things are removed in the sim, such as traffic control you no longer hear, only yourself can be heard. planes also suddenly no longer have navigation lights, and what is worse, Aerosoft Simple Traffic aircraft are no longer visible at the gate. I think this is because of the RAM problem. XBOX has reduced the use of RAM. One solution would be to make a setting in MSFS2020 where you can specify how much ram you have installed on your computer, so that usage can be adjusted according to your amount of RAM you have installed. Currently the RAM usage is hard coded.
I have this problem too but it seems fixed if I fly in shared cockpit this is so strange.
This is a known problem with Your Controls. If you fly alone but with the YourControls utility in the Community Folder and without running a server, you get stutters/lag after a while. The fix is to remove the YC folder from the comm folder when flying alone. It makes a great difference.
YC stated that in the last update this problem should have been fixed, yet I still encounter this problem when flying. I guess it’s still not fixed then.
Sorry if this has been posted before, but I had the vfr map on , deleted it and my frames came right back
Now this may be slightly off topic … but maybe it helps to remove one aspect that will otherwise make it harder to detect the real cause(s) of FPS degradation.
A few days ago I switched my rolling cache from SSD to RAM disk. For more details see:
… and I did get a more consistent FPS experience.
However, the dramatic FPS drops discussed here must have (a) primary cause(s) which are not rolling cache related.
Just started to notice this issue as well…
From KPDX to KLAS with the PMDG B738
A huge drop during final approach when switching to external view.
I’m a little afraid when I see this topic is 1 year and a half old, with +3k messages…
I’ve only ever had the v low frame rate glitch once, but when closed the VFR map, the framerate came right back up again.
Unfortunately I cannot say since when exactly I experience the problem, but I have had it for months for sure - at least sporadically. In the last 1-2 months CTDs in mid-cruise have been quite frequent, so the performance drop hasn’t been as apparent becaus flights didn’t get to be long enough. Since about 1-2 weeks ago CTDs have gone down, so I am starting to see some patterns, although I am far from understanding what is going on here.
I don’t have the best or most modern hardware; especially the CPU usually runs at high load percentage when playing MSFS, but I still manage to get between 30 and 50 FPS at a decent graphics quality level. This is a screenshot of what the performance normally looks like:
I think the fact that MSFS doesn’t really make good use of available RAM (what the heck do I have 32 GB for???) is known.
Anyway, here is what I observe:
As long as I keep my flights at under 3 hours length, everything is fine. Between 3 and 3.5 hours I start to notice gradual FPS deterioration. After around 3.5 hours, performance looks like this:
What I find interesting is that CPU load doesn’t really go over 50% anymore, and GPU load looks to have single isolated peaks only. All in all, I can’t avoid the impression that MSFS is simply not making use of the available hardware anymore.
In the end, around landing I usually encounter single digit FPS values, in part even values below 1 - the sim is simply not playable anymore.
This performance drop persists when I am on the ground. If I go back to the main menu, performance and hardware usage are OK, but if I load another flight (at the same or at a different airport), I jump right back to single digit FPS values. So the sim itself seems to be stuck in this low performance mode, while the rest (i.e. menus and such) isn’t. The only thing I have found so far that resets the initial performance is exiting MSFS completely and restarting it.
By the way: I use the FBW A320NX almost exclusively. However, I don’t think this performance drop is related to the aircraft, since I have tried to load a new flight with a different aircraft after the performance drop and the performance stays low. Also, other people have reported similar behavior with other aircraft like the PMDG 737. So no, I can’t be sure, but I really don’t think it’s that.
In any case, I hope that my observations might help in finding the cause for this. Otherwise, I hope that SU10 might bring about some solution to this, because not being able to make longer flights is a real bummer for me.
Windows performs resource and memory management and allocates RAM as needed, not MSFS. There are other programs that occasionally use RAM and if MSFS used all 32 GB how would anything else run? The reason why you have 32 GB is so that multiple programs can run at the same time without impacting other programs. MSFS can run on systems having only 8 GB. How is that possible when MSFS uses a lot more? Windows will allocate virtual memory to whatever MSFS needs. Windows then maps the virtual memory used by MSFS to RAM whatever is installed. MSFS doesn’t know or care where Windows allocates virtual memory. AS USERS WE CARE very much about where Windows allocates virtual memory because of the significant FPS impact. When 32 GB of RAM is installed we are asking Windows to put the memory needed by MSFS into RAM. But Windows deliberately ignores our request which is why it appears that MSFS doesn’t use all the available memory.
Regarding the FPS drop during long flights, I am puzzled because I regularly fly 4 to 5 hour flights on a daily basis without performance issues (40+ FPS at 4k dropping to 30+ at very large airports). We all have different hardware and non-MSFS software. We all use different aircraft and customize MSFS to our needs. MSFS (and Windows) try to be “one size fits all” sometimes unsuccessfully.
There ARE significant performance drops after flying for a few hours that need to be fixed. I hope this is fixed in SU10 without breaking anything else.
Thank you using the Bug section, using templates provided will greatly help the team reproducing the issue and ease the process of fixing it.
Are you using Developer Mode or made changes in it?
No
Have you disabled/removed all your mods and addons?
No
Brief description of the issue:
After exactly 5 hours and 10 minutes spent flying a long haul trip all the way from Rome to Karachi, MSFS decided to become extremely laggy and and its overall performance dropped noticeably. Yes, I do have mods installed, plus a flight tracker, but it’s not the first time I encounter this issue as it already presented itself a few weeks back, even with no mods installed. Here I was flying the CaptainSim 777-200ER, when the flight simulator decided it was time for it to start lagging. Here below is a link to the issue.
Provide Screenshot(s)/video(s) of the issue encountered:
Detailed steps to reproduce the issue encountered:
PC specs and/or peripheral set up if relevant:
i5-7500 3.40GHz
GTX 1060 6GB Gaming X edition
16Gb DDR4 3000MHz RAM
1x Toshiba 2TB HDD (where the game’s stored)
2x Samsung 500gb SSD (where 40gb of the game’s rolling cache are stored)
That’s pretty much it.
Build Version # when you first started experiencing this issue:
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Do you have the same issue if you follow the OP’s steps to reproduce it?
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I’ve read about this now it has happened to me. Simply trying to cross the pond on vatsim, i get near the east coast of Canada and I notice FPS changes. Before I know it, I now have 10fps. I quit vatsim, restarted the program and the sim crashed to desktop. Also plugging things into USB crashes the sim.
Well i would like to take the time to say welcome to this post! A year and a half later and i STILL cannot perform long haul flights.
Wow, this is to say the least, astonishing. No warning, after several hours of flying this weird memory leak issue presents itself and many of us long haulers can’t do anything but restart the sim. Maybe it’s jus me, but in my opinion this massive issue isn’t talked too much about here on the forums and what I really find disappointing is the fact that in all these months there have been no improvements, from what one can read above. This really should be in some top 3 priorites for Asobo to fix (As I hope it is). Until then, hopping around European cities I guess.