I have the same experience as the OP, especially since SU11. The other day around London I was getting a measly 5FPS in the Fenix — something that I have had in the past after very long flights. At the moment the Fenix is largely unflyable for me. Switchover to the PMDG 737-700 and I'm getting in the 50s, and over to something like the Longitude or TBM and I get a stutter-free smooth-fest around 60+.

My CPU temps are in the 40s-50s and I'm running a decent i7 10700K with an RTX 3080. A friend who has a similar setup (with less strong GPU, but the same wide screen 1440p setup) doesn't have the same issues as I do.

3 minutes ago, JYW said:

This is definitely the issue.  There are many reports of degrading performance in MSFS over time.  I can almost guarantee that if you restarted MSFS after your first leg, then completed your second leg, you'd have dramatically better performance.

Seems like some sort of memory leak over time, but yes, it's very real.

I agree Bill.  I can get away with it if I am flying in modest scenery but otherwise I reboot and relaunch MSFS.

16 minutes ago, Noel said:

I agree Bill.  I can get away with it if I am flying in modest scenery but otherwise I reboot and relaunch MSFS.

Yes, same here.   If I'm doing a few short hops between several airports in the C152 etc I won't restart but anything complex, it's always worth the investment in time to restart. 👍

49 minutes ago, JYW said:

This is definitely the issue.

No it isn't. It might be.

49 minutes ago, JYW said:

There are many reports of degrading performance in MSFS over time. 

And many to the contrary. It doesn't happen to me. Not in MSFS. I can do legs all day and my performance when I shut down at the end of the day is the same as it was at the start.

4 hours ago, Jazz said:

No it isn't. It might be.

The intention of my post was to try to help the guy.

It's great that you don't see any degradation of perfmance over time, but I think it's fair to say that a lot of people do.  Maybe it depends on people's individual systems.

Considering he was using:-

• Fenix A320 (resource-demanding)
• Flying into EGLL; one of, if not the most resource-demanding areas in the sim)
• Was flying with traffic enabled
• Flew two back to back legs

... I think it was a fair suggestion that trying a restart between legs might help him. Sorry if my terminology did not adhere to laboratory-certified levels of logic 😁

Do you have any suggestions for the OP?  Or did you just post to critique my suggestion, and let us know that things are working great for you?

Edited February 1, 20233 yr by JYW

3 minutes ago, JYW said:

We're getting pedantic down to the letter now....  I love it when we post these critiques of other members posts, picking out laboratory errors in word choice.

In the spirit of trying to help the guy, back to back flights in one of the most resource-demanding aircraft, in the most resource-demanding area of the FS world, with traffic enabled, just might not be the best idea.

I say again;   Fenix A320 ..... LHR ...... Traffic .......... two consecutive legs.

That may work well for you, but I think I can confidently say it would cause some performance reduction for most.

But I'm sure he appreciated your help letting us know that you, somewhat rarely see no performance reduction over time in MSFS.

I challenge you to provide evidence of no FPS reduction whatsoever between the start of a flight in a 'heavy' aircraft, and, let's say 5 hours later.    Second thought, don't bother.   I'm sure we'll both sleep easy.

You made a definitive statement that read "That is definitely the issue".. In the interest of helping the guy get to the bottom of his issue he should be aware that actually, it may not be the issue at all. You say pedantic but I say It's honest. Perhaps we can agree that it can only be a definitely maybe. No more.

I know it may not be the issue because I do exactly this all the time and always have done in every sim I have used and it simply has never been the issue that people have made it out to be and in MSFS it's not an issue at all in my experience. It used to be more likely to be problematic. The last time I had any trouble doing this was way back in FSX with all sorts of stuff loaded in doing all sorts of things. Granted, that is my experience. I have no idea how other people have their sims set up or what kind stuff they ram into them all the time that could create such problems but I do not suffer with performance degredation by doing multiple legs. Fact. I just don't and if I don't plenty others don't either. I would notice if I did, I assure you. And it's important to me because it's how I enjoy the sim the most. I enjoy the multileg uninterupted flights. I don't know why, I just do. Always have. 2 hours there, 2 hours back, and hour somehwere different another hour back. I do it all the time. I binge sim in this manor. I have tried to get help but people find it hilarious😉

And why on earth would I need to prove to you or anyone else that this is true? Really? What a strange thing to say.  And how would I go about it anyway? Should I record a 10 hour sim session with a frame rate counter to show you that it's the same when I finish as when I started? Would you sit and watch it all to be sure it wan't editied to order to continue my conspiracy? Of course you wouldn't. What would be the point exactly of me being here telling this tale if it were not true? Silliness.

Please, I pointed out what I pointed out because it mattered and for no other reason. It really is as simple as that. I have no interest in making it about anything else.

Good evening to you.

I've had this a couple of times when running DX12. It eats up vram. My 3080 has 10g vram and it can still run out and fps will nosedive. Using DX11 I have no problem.  Just a thought .

Thanks guys. 

I’ve overclocked my CPU to 5Ghz so will be interesting to see what difference this makes. I’ll report back. 

4 hours ago, BWBriscoe said:

Thanks guys. 

I’ve overclocked my CPU to 5Ghz so will be interesting to see what difference this makes. I’ll report back. 

Good for you BWB everyone's CPU is a limiting factor and guaranteed it will be a meaningful factor in your performance capabilities.

I had this problem a year ago. I had assigned a command to cycle marker lights to a switch on my throttle which is not spring loaded, the toggle switch stays where you set it. Anyway, the lights were turning on and off continually and I didn't realize it (was flying in broad daylight).

Everything was fine until the flight time was building up and fps would keep on decreasing little by little. This was every flight with every plane.

I found the problem in windows control panel / Devices and Printers / Open / to see the Windows illustrated diagram showing one windows DX button was cycling on and off rapidly and continually. My fps would decrease from 40 down to 5 in an hour and a half long flight.

I unassigned that command in MSFS options and the problem vanished. 

So I overclocked the CPU to 5Ghz and did LHR-MAD-LHR. At Madrid I exited the sim, restarted my whole system (PC too), flew back to LHR and frames were like butter...so smooth!

So either it was the CPU overclocking, restarting the sim or a mixture of both that made the apprach into EGLL flawless - even at night with a lot of FSLTL traffic.

18 minutes ago, BWBriscoe said:

So I overclocked the CPU to 5Ghz and did LHR-MAD-LHR. At Madrid I exited the sim, restarted my whole system (PC too), flew back to LHR and frames were like butter...so smooth!

So either it was the CPU overclocking, restarting the sim or a mixture of both that made the apprach into EGLL flawless - even at night with a lot of FSLTL traffic.

As another data point, I always restart the sim if I'm doing another leg in a complex airplane.  It could be me over-reacting or being super-cautious, but I've never had an issue with a frame-drop like you described, doing it the way I do it.  Maybe when I re-build my rig I'll be bold and try a back-to-back flight like LHR to ATH and ATH to LHR.  I'm usually to scared to try that.  heh.

I trust you're now running an XMP memory profile too?  Your overclocking info Noel gave you should have outlined that.  It can give you another 5-10% of performance, depending on how slow or fast your memory was running.   2133 mhz to 3600 mhz can do quite a bit for you.

25 minutes ago, Mace said:

As another data point, I always restart the sim if I'm doing another leg in a complex airplane.  It could be me over-reacting or being super-cautious, but I've never had an issue with a frame-drop like you described, doing it the way I do it.  Maybe when I re-build my rig I'll be bold and try a back-to-back flight like LHR to ATH and ATH to LHR.  I'm usually to scared to try that.  heh.

I trust you're now running an XMP memory profile too?  Your overclocking info Noel gave you should have outlined that.  It can give you another 5-10% of performance, depending on how slow or fast your memory was running.   2133 mhz to 3600 mhz can do quite a bit for you.

Yes I am running XMP thanks.

When I'm feeling bold, I'll try a back to back again!

Could this be a memory leak over time? I know we don't have any study-level long haulers yet, but once PMDG releases the 777 etc, I'd like to be able to fly a long haul flight into London. Will I still have the same problems?

1 hour ago, BWBriscoe said:

Yes I am running XMP thanks.

When I'm feeling bold, I'll try a back to back again!

Could this be a memory leak over time? I know we don't have any study-level long haulers yet, but once PMDG releases the 777 etc, I'd like to be able to fly a long haul flight into London. Will I still have the same problems?

It could be, but not necessarily in the sim.  Lots of variables at play.

The A310 can do some pretty borderline long-haul routes. I did a leg from Lisbon to Rio de Janeiro, which is about 4,200 nm, and I still had some fuel left, I'd imagine it could have gone to Sao Paulo at least, still with a 30 minute reserve.

So I flew a few circuits around EGNT in the Fenix A320, did a full stop landing, reloaded the aircracft and flew down to EGLL (without restarting the sim) and I got low frames again (not half as bad as before however). So, from my experiements and flights straight to EGLL, frames are good, any flight that includes a stop somewhere else before flying onward to EGLL results in poor frames on arrival in London. Does this mean it is some kind of memory leak? What is the possible solution?