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piperarrow41

FPS Drop Over Time

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Initially the sim is completely smooth and stutter free, but after about an hour of flying it seems like FPS drop and things start to stutter, especially during approach and landing.  If I restart the sim the process starts all over again.  Is anyone else seeing this?

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I had the occasional stuttery approach in the past but couldn't discern a pattern, especially regarding flight time. My flights are typically in the 1:00 - 1:30 hours range. However today (after 1.15.10 update) after 2:20 hours flighttime the approach was a stuttery mess like never before, and after restarting the sim at the same location with the same weather conditions everything was smooth as silk. Clearly something to keep an eye on....

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3 minutes ago, Tom_L said:

I had the occasional stuttery approach in the past but couldn't discern a pattern, especially regarding flight time. My flights are typically in the 1:00 - 1:30 hours range. However today (after 1.15.10 update) after 2:20 hours flighttime the approach was a stuttery mess like never before, and after restarting the sim at the same location with the same weather conditions everything was smooth as silk. Clearly something to keep an eye on....

Oh no! Is this before or after today's (May 6, 2021) mandatory update? Another one step forward, two steps back?


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This is something I had for 2 months. I use the Prosim 737-800 cockpit suite.

Then I found out the the WASM file that Prosim used caused this. I removed it and now I can fly without the dreadful framerate reduction over time....

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13 minutes ago, Twenty6 said:

Another one step forward, two steps back?

Too early to tell imho, let's see if more reports pile up....

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It has been happening the last couple of days so I don't think the update has anything to do with it.  

After doing some research on the net it might be the light bloom effect which I just recently enabled.  The last couple of flights have been late afternoon into the night and it seems like the stutters start after dark when approaching an airport or city.  I will try shutting bloom off and see if that helps.

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If you mean regular bloom then this is not effecting only lights but everything you see.. all the time. Day and night.

I do experience this FPS drop over time to some degree for quite some time now. Usually on approach after a hour or two long flight I have about 5-10 less FPS then if I reload the sim and start/load on that same approach. There's also a thread in the official forums where somebody did a test just sitting on the apron for a few hours and the FPS dropped over time considerably.

I just got used to it since it's not on any Asobo radar for solving.

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2 minutes ago, Tomaz Drnovsek said:

If you mean regular bloom then this is not effecting only lights but everything you see.. all the time. Day and night.

I do experience this FPS drop over time to some degree for quite some time now. Usually on approach after a hour or two long flight I have about 5-10 less FPS then if I reload the sim and start/load on that same approach. There's also a thread in the official forums where somebody did a test just sitting on the apron for a few hours and the FPS dropped over time considerably.

I just got used to it since it's not on any Asobo radar for solving.

I tested this last night with a 787 and 3 hours flight. By the time I reach my destination I was about 10 fps lower on approach. 


Claude Desrosiers

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Performance drop over an hour could be an oveeheating GPU or CPU. Could also be a memory leak. Most of my flights are less than an hour though, so it's not a problem I've had.

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1 minute ago, cianpars said:

Performance drop over an hour could be an oveeheating GPU or CPU. Could also be a memory leak. Most of my flights are less than an hour though, so it's not a problem I've had.

I suspected that at first too. It's not. I monitor the temps and are well below any threshold limit.

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My first thought was an overheating GPU.  The system is an Alienware R11 liquid cooled I9 10990K, RTX 3090 with 64 GB memory.  The CPU runs at about 55-60C, GPU about 65-70C and memory usage is about 15GB.  

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Just now, piperarrow41 said:

My first thought was an overheating GPU.  The system is an Alienware R11 liquid cooled I9 10990K, RTX 3090 with 64 GB memory.  The CPU runs at about 55-60C, GPU about 65-70C and memory usage is about 15GB.  

Those temps are pretty cool 😎

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6 minutes ago, cianpars said:

Performance drop over an hour could be an oveeheating GPU or CPU. Could also be a memory leak. Most of my flights are less than an hour though, so it's not a problem I've had.

my gpu was at 77c and my cpu at 63c. Way from from TJ max and throttling. 


Claude Desrosiers

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It is one of those things that is difficult to pin down and it is intermittent for me.

I have had it on flights over about 90 minutes, and I have 32 GB of RAM.

I get it even with a fresh reboot and a renamed community folder, so I suspect a memory leak related to certain default scenery areas, or a lack of flushing when scenery is out of range.

I don't blame Asobo, and I appreciate how complex flight simulators are.  Hopefully these bugs can be traced and closed out over time. 

I think a lot hangs on DX12.  Not because it will necessarily fix these issues, but Asobo may have more determination to try to trace them after that, because at the moment it could be a waste of time when things are about to change anyway.


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