After SU10, FPS still drops during flights

Bug Reporting Hub Install, Performance & Graphics
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22

The dreaded drop in fps has just happened to me.

Currently flying EGLF-EYVI. Had average of 35fps on the ground at EGLF. Burning Blue’s EGLF, that is. It’s a very detailed dlc airport, so I accept some deterioration of fps there. Once I took off my fps started to climb, even as I passed over London. Eventually I had a steady fps of about 70 as I climbed higher. Then suddenly, as I passed over the northern coast of Germany, at FL450, my fps plummeted and now sits at 10fps.

I’ve looked at task manager and there is nothing of note there. Certainly nothing heavily using disk, memory or CPU. Even FS doesn’t seem to be using much.

I went into FS settings and turned off multiplayer, AI aircraft, and even all online functionality. Nothing improved the fps. The only time fps increased was when I paused the game to go into the settings. As soon as I pressed ESC the fps jumped to 87. As soon as I unpaused the game, the fps dropped again to 10.

Eventually, I saved the game, shut down game and rebooted PC. Then relaunched the game from the save, and all is well again with fps of 77.

HAGS is off,no GeForce overlay (not even installed), latest driver (517), Win 11 22H2. All day yesterday (3 flights) all was fine. Very good in fact.

I wonder what is causing the random drops in fps. Seems to happen randomly. Strange indeed.

Saving a game and relaunching from save does mess up the logbook, but I don’t use it anyway. I have an Excel spreadsheet on which I record all my flights.

Win 11 22H2 (all up to date)
i9-10900k 3.7 GHz CPU
RTX 2060 GPU
32 Gb DDR4 RAM

Flying default Cessna Longitudinal
1x orange tabby cat as co-pilot.

Edit: Bah! Despite saving, rebooting and launching from save, which did fix the problem, my fps are dropping once again. Gone from 80fps to 17fps over central Germany. :thinking: Swear-wording game! :enraged_face:

6 Likes
23

If you look over this thread, the vast majority of cases involve airliners of some kind. There may have been a single TBM 930 user some time again, but it’s an outlier.

I tend to fly GA, and I never get this. Although a single time I had a weird thing where as I landed my frame rate plummeted, and recovered again as soon as I took off. So not quite the same as this.

If I had to guess I would say it’s related to the systems in these more complex aircraft, coupled with their usage which is often multi hour flights.

The longest flights I have ever had were about 5.5 hours, and that was in one of the Just Flight Arrows, and also in the default 172. No never saw FPS slow down on these longer fights. Most of mine are around the 2-3 hour mark.

I had previously asked if anyone who gets this all the time had tried switching to a small GS plane, flip on the AP with unlimited fuel, and just leave it running for hours to see if the fault occurs.

My bet is it doesn’t, but I don’t think I got any takers on that.

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24

I’m experiencing this in the default Cessna Longitudinal. It doesn’t always happen though. Yesterday was fine, having completed three flights in it. Today, the above problems in the same aircraft.

I’ll try a long flight in a small Cessna GA plane and see what happens.

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25

I suspect the actual flight plan has no bearing on this, but it wouldn’t hurt to keep as much as possible identical, other than altitude. As long as the flight is as long as you would expect to see the error occur, I think that is the important part. So re-flying a route at a altitude the 172 or similar can do, while avoiding terrain for the duration would likely suffice.

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I’ll try the same route, though I won’t be able to climb to FL450 :rofl:

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27

I’ve taken off in a Cessna 172 Sky-something or other. Same flight plan, but much lower altitude.

Yesterday I did two three-hour flights in the Longitudinal with no fps issues at all. Today, albeit on a different route, I only got about 30-45 minutes into the flight before it occurred. Restarted the sim and loaded in the flight from its saved position, and continued on. After about 30 minutes, fps dropped to single digits. It really does seem hit and miss, regardless of length of flight, though I do guess that the longer you fly the more chances you have of the fps drop occurring. Rarely had this in SU9. Could it be the new GPS system, the GX thingy that’s in the aircraft now? :rofl:

I’m cruising at 6000 ft currently flying between EGLL & EGKK as I head out of EGLF towards EYVI. FPS currently sits at 43.

I have switched on unlimited fuel and will continue heading towards EYVI for as long as it takes, though I’ll have to stop in 4 hours as I’m working lates today. Let’s see how the flight goes over the next three to four hours.

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28

Good luck. I look forward to your results.

29

Game just CTD. Stuff this. I’ll try again tomorrow.

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30

I am pretty sure it happens in GA planes after 5 or 6 hours or in airliners when you do long trips.

Nevertheless I can assume this theory is compatible as it might happen more in airliners because of longest trips or maybe more data consumption if higher (i don’t really know this).

Specially if you accelerate time.

I think it’s related to scenario downloading but it is only a suspicion. Maybe it helps.

Regards.

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31

It may even be altitude related. I guess its possible that at higher altitudes more terrain is having to be loaded in, even if it is at much lower details as its so far away. Kind of clutching at straws now.

32

There is no easy answer this is what I found on my system.
CPU i912900K
CPU RTX 380TI Nvidia Founders
RAM 32GB DDR5
Even though my GPU is water cooled my case was getting hot running the system @ 100%
so turned it down in the BIOS to 80% which kept my temp under control.
But now flying on a 1200mile leg at 38,000 after about an hour or so I noticed that my GPU and CPU throttled back by about 35% as my frame rates dropped by the same amount. I then increased my system power to 85% and watching my temps carefully I did the same trip without any frame drop.
My wattage increased from an average of 480watts to 530 watts, but my temps are OK.
It is getting costly running the simulator at 530watts. That is the cost of flying without stutters?

33

With SU 10 I am having the worst fps in FS 2020. I am back in P3D/FSX condition with bouncing landing after the stutter and -15-20 s freeze… Both start and landing are now hopeless.

I got screaming passengers from FS Realistic pro every time :face_with_hand_over_mouth:

Julean

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34

Is this your GPU power consumption or the power used by your entire system?

35

No that is for the entire system.
The Graphics card takes about 280-300 watts.
Like I said I tuned it down by 15% The RTX 3080TI is almost the same as the RTX 3090 except for the memory.

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36

So did Asobo by any chance figured out the issue with going from airport to airport and your frame sinks? i take off with 45 fps and land with 27 fps, and this is at all airports. I Can reload at the landed airport and fps is back to 45fps or even higher somtimes, i don’t understand and been having this issue ever since the sim launch sooner or later i feel like ill let the sim go tbh… it doesnt matter how big the airport is either fps goes in the gutter

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37

The above post is the perfect summary. Take off with 45fps land with <20fps. Reload to exact same place and back to 45fps.

Please, please fix this (SU10 did not help)

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38

How did you get on with your GA test flight(s)?

39

It has to be related to traffic or airport ground vehicles I think. Anyone who always gets the FPS drop try doing a flight with all traffic and ground vehicles/workers fauna etc set to 0. Tell me how you get on.

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40

I’ll make this brief as I know this is a bug thread and don’t want to dominate it with chat. The GA flight went well, but another flight today not so good: Discussion + Poll: Sim Update 10 (1.27.21.0) - #1395 by Mikebuch87

41

The thing that is so frustrating, is that I had a perfect flight (of over one hour) at the weekend. With horrendous weather, which should’ve brought my system to its knees but didn’t. Today, I flew the same flight again, having made no changes to my system, or added anything, and after half an hour, it ground to a halt at eight frames per second.

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