Powerful computer - Progressive stuttering and lag

[markgrinyer 6]

Hi

I just brought a new PC to run MSFS properly, but as time goes on during a flight there is a slight stutter or lag (starting within a few minutes of being in the world) to significant lags to stutters making it unplayable on final approach and after landing.

My new system is more than capable. 
i713700K OC 5.2
GTX 4080 16GB
32GB 5200mhz 

DLSS3 is enabled but has no effect

Honestly I don't even know where to start. All the drivers are up to date, I have changed the priority of flightsim.exe to highest on the processor priority (not realtime), and deleted the rolling cache which seem to be the most common found fixes on youtube, although these seem to be for older sim updates 

My Microsoft install is split across 2 drives, with Flight simulator on the main .M2 drive and the community folders on a HDD as I'm trying to keep the .M2 usage down below half to prevent is slowing down

Any ideas on where to start looking.    

[Silicus 901]

I highly recommend this video: 

https://www.youtube.com/watch?v=DB4WNQJ77f0&t=14s

It helped me to get rid off stutters on my mid range system! I really think it is worth a try. It is mostly about deleting the shader cache...

Good luck!

[Muds 31]

1 hour ago, markgrinyer said:

the community folders on a HDD

eh that could be your answer, i had a friend doing the same thing with linker on HDD, i told him to try everything on SSD, it was night and day for him, never had to bother with settings and such all the time. It also makes some sense, if every time FS need to access something on the HDD it's going to be super slow

[Bert Pieke 7,604]

24 minutes ago, Muds said:

eh that could be your answer, i had a friend doing the same thing with linker on HDD, i told him to try everything on SSD, it was night and day for him, never had to bother with settings and such all the time. It also makes some sense, if every time FS need to access something on the HDD it's going to be super slow

In that case, start up with the Community folder empty, as a test.

I would be surprised if that were the culprit.. 😉

[Bert Pieke 7,604]

2 hours ago, markgrinyer said:

Any ideas on where to start looking.    

As a test, turn off Traffic.

[avistudent 51]

I had the same result too after my recent upgrade.

My current setup is 13600K with 6750XT at 1440p

But I would keep all your FS related folders in the SSD NVME drive, what brand are you using?  It doesn't really slow you down on the read speed, it is more on the write speed.  You should be ok at 80 to 90% of the capacity.

What resolution are you running at?

Do you have ReBar enabled? I got some boost with it.

Also, you may want to disable the refresh rate, experiment it, in my case, turning it OFF pretty much got rid of 98% of my stuttering, or the sweet spot is 50% if i wanted to enable it.

The TLOD, i think between 150ish to 200 is ok, but you have to play around with the settings, same for other LOD....most ULTRA settings doesn't do much impacts.  

Some times DLSS might not be the best setting where TAA may perform better.

Remember DX12 is still in beta.

For traffic, i only use FSLTL, with no injector, only using FS live traffic, setting at 20 to 30 for ground traffic

Good luck!  You have a great setup

 

 

Edited February 11, 2023 by avistudent

[David Mills 4,774]

Enable DX12. Your MSFS setup probably defaulted to DX11. If DLSS 3 has no effect, it's because DX12 is not enabled. And remember that changes to the DX version do not take effect until you've closed and rebooted the sim from scratch. Also, make sure your LOD and Render Scale are not ridiculous.

Edited February 11, 2023 by David Mills

[markgrinyer 6]

Hi All

I moved everything back on to the NVME and done the steps in the video. Did a flight from EGCC to EGAA (previous flight was EGPE to EGCC) and it seemed to be running smoother (shame my landing wasn't lol) after putting FSTL back to default settings.

Answers to the questions

DX12 is enabled

Running at 3840x2160.

What's Rebar?

Refresh rate is 100% of monitor refresh rate which is 60hz as I use a TV.

TLOD is 325 (random, guessing Nvidia did it) as I know I have a beefy system now (bit more than my old 4770k and 2090ti lol). Pretty much everything is at Ultra. I have TAA on with DLSS3 as DLSS blurred the motion of the instruments as it does in other games. Render scale is 100

 

I'll now fly back to EGCC and see how it handles going back into a busier airport than EGAA

Thanks everyone for taking the time to reply and share ideas

Edited February 11, 2023 by markgrinyer
More details

[Bob Scott 7,779]

17 minutes ago, markgrinyer said:

What's Rebar?

Resizeable BAR (base address register)--it's a feature of later versions of PCIe that allows the CPU to have direct access to the full GPU frame buffer, rather than just paging in 256MB increments.  Has to be enabled in all three of the motherboard chipset, the GPU firmware, and the CPU microcode to be activated.  So far I haven't seen any real beneficial use of the capability in any flight sim.

[shamrockflyer 647]

Are you motherboard drivers up to date? I upgraded my CPU recently and jumped straight into the sim not thinking about the motherboard and performance was awful. Updated the drivers and the difference was night and day. You could also try installing your graphics drivers using NV Clean Install. Nvidia installs lots of bloatware on a machine with the geforce experience. You could also download ISLC Intelligent Standby List Cleaner to purge memory. Not setting everything on Ultra could also help you out, watch some videos on settings guides to get the most out of your system. Also make sure you're not bottlenecked by your CPU.

[markgrinyer 6]

Hi

Just finished the EGAA-EGCC flight. Seemed reasonably smooth (would stutter for a few frames then go back to being smooth again) until I touched down when it would start lagging in bursts a lot more, mainly going over fresh concreate patches on the runway. I am using MACCO EGCC which I got because reviews said there was little impact on FPS, and I never had any issues on my older system which was far less powerful.

 

During taxiing to the gate I reduced the Terrain LOD to 200 and objects LOD to 100, and it got worse. It seemed to settle down to a few lags in a 5 second window once had turned of RWY23R and facing the terminal buildings with TLOD at 325 and OLOD at 200 

 

My next flight is EGCC-LFPG (I use a pilots life V2). That will be more of a test of if it is something building up and not clearing such as memory as it will be the longest flight I will have done on this PC, but will have to wait until Monday afternoon UTC at soonest  

 

My entire PC is new so I believe my motherboard drivers are up to date. I shall have a look and update if required

[rickjake 249]

What motherboard do you have?

If its a 790, you might want to check this link.

After upgrading my PC, I was getting long pauses all the time. Turns out it was the network chipset on the 790 motherboard.  Had to add a PCIe network card and disable the onboard network. Solved the majority of all the pauses I was getting. 

[ThomseN_inc 1,128]

TLOD of 325 seems pretty high imo.

[Marcin_Poland 2]

tlod 325 it's way too big even for a 13700 -  Set to 200 and leave, second thing - you have a new system similar to mine and you need to check and update your motherboard bios. If you have series 7, the first bios are test bios - only now they come out better refined. 

Edited February 12, 2023 by Marcin_Poland

[markgrinyer 6]

Hi

 

I've turned TLOD down to 200 and OLOD to 100 but the stutter is still there. Above about 5000ft its a stutter for about 0.1 of a second every 2 seconds. Below 5,000ft particularly on approach its a stutter of about 0.5 seconds every 2 seconds. I have asked my PC manufacture how to update the BIOS as its under warranty and I see stuff about downloading software I know nothing about. I tried turning down all the ultra settings to high but this had no effect, neither did closing FSTL