High fps but stuttering

[Ragnaroek]

Hi folks,

I just updated to Win11, reinstalled DCS and using a Crytsal.

system specs: 

5800x3D

4090

32Gigs of RAM at 3200MHz

RogStrix B550 motherboard

 

My problem:

don’t wanna go too deep into the Crystal setup as this is maybe not needed right now but I am using the OpenXR toolkit and the OpenPX software.

My Grafik setup is mostly high but many things are turned down or off as well and I am not overloading my PC I guess.

Flying my test mission in Syria/ Free Flight/ F16, it gives me between 75 to 80 fps but looking sideways I have heavy stuttering - the frame counter does not drop during that.

with these fps, the stutters should be eliminated but they are there as I would have 25fps.

Turning down the resolution to from 3200x to 2600x eliminated the stuttering but the frame rate counter doesn’t do much - maybe goes to 85-90 - but that can’t explain why even with 80fps before it feels like a cinema in old times.

plus, going down below 3000pixels looks waaaay worse than in the G2 before.

I tried quite a few things with upscaling in openxr (motion reproduction is not available in the Crystal) but that all doesn’t change it.

 

every help is highly appreciated! I tried to find something in the forum but couldn’t find a solution - maybe you guys are in a better work-flow regarding this problem.

thanks and always blue skys

[Loukuins]

14 hours ago, Ragnaroek said:

Hi folks,

I just updated to Win11, reinstalled DCS and using a Crytsal.

system specs: 

5800x3D

4090

32Gigs of RAM at 3200MHz

RogStrix B550 motherboard

 

My problem:

don’t wanna go too deep into the Crystal setup as this is maybe not needed right now but I am using the OpenXR toolkit and the OpenPX software.

My Grafik setup is mostly high but many things are turned down or off as well and I am not overloading my PC I guess.

Flying my test mission in Syria/ Free Flight/ F16, it gives me between 75 to 80 fps but looking sideways I have heavy stuttering - the frame counter does not drop during that.

with these fps, the stutters should be eliminated but they are there as I would have 25fps.

Turning down the resolution to from 3200x to 2600x eliminated the stuttering but the frame rate counter doesn’t do much - maybe goes to 85-90 - but that can’t explain why even with 80fps before it feels like a cinema in old times.

plus, going down below 3000pixels looks waaaay worse than in the G2 before.

I tried quite a few things with upscaling in openxr (motion reproduction is not available in the Crystal) but that all doesn’t change it.

 

every help is highly appreciated! I tried to find something in the forum but couldn’t find a solution - maybe you guys are in a better work-flow regarding this problem.

thanks and always blue skys

You might be getting some VRAM issues, in VR DCS can exceed 24GB of VRAM usage, turn down MSAA and Texture setting and delete your fxo and metashaders2 folders (in saved game) and check if it fixed your issue.

[Ragnaroek]

No, fortunately that didn’t help.
Great fps but stuttering like crazy looking everywhere else than sideways. 

[Loukuins]

1 hour ago, Ragnaroek said:

No, fortunately that didn’t help.
Great fps but stuttering like crazy looking everywhere else than sideways. 

Are you using a SSD or not ? Did you set up the pagefile correctly ?

[MoleUK]

1 hour ago, Ragnaroek said:

No, fortunately that didn’t help.
Great fps but stuttering like crazy looking everywhere else than sideways. 

If you mean the stutters are not showing on the fps graph but instead are purely visual, do me a favor and try locking DCS' fps in nvidia control panel to your headset refresh rate, then do the same in the graphics.lua, see if it changes anything.

24 minutes ago, Loukuins said:

Are you using a SSD or not ? Did you set up the pagefile correctly ?

He's talking about this sort of problem, which is not hardware related. It's a DCS MT problem.

Playing around with fps caps and refresh rates seems to help minimise it if not eliminate it entirely.

 

Edited September 3, 2023 by MoleUK

[Loukuins]

6 hours ago, MoleUK said:

If you mean the stutters are not showing on the fps graph but instead are purely visual, do me a favor and try locking DCS' fps in nvidia control panel to your headset refresh rate, then do the same in the graphics.lua, see if it changes anything.

He's talking about this sort of problem, which is not hardware related. It's a DCS MT problem.

Playing around with fps caps and refresh rates seems to help minimise it if not eliminate it entirely.

 

 

Oh... I might have this issue too then! 

[MoleUK]

1 hour ago, Loukuins said:

Oh... I might have this issue too then! 

Everyone does, it seems something gets out of sync and terrain stutters even at 180 fps while everything else is smooth. Capping your fps via nvidia and the graphics.lua seems to reduce it if not stop it entirely, just cap it at your VR headsets refresh rate or your monitors refresh rate.

[Loukuins]

1 hour ago, MoleUK said:

Everyone does, it seems something gets out of sync and terrain stutters even at 180 fps while everything else is smooth. Capping your fps via nvidia and the graphics.lua seems to reduce it if not stop it entirely, just cap it at your VR headsets refresh rate or your monitors refresh rate.

I don't use VR headset

[Loukuins]

On 9/3/2023 at 6:50 PM, Loukuins said:

Oh... I might have this issue too then! 

I do and limiting the FPS back to my Refresh rate make the game more smoother and disabling V-Sync help too !

[jurinko]

Open the Windows OpenXR tools and check both options under the reprojection settings. Nvidia flow and something else.

[LOW_Hitman]

Am 4.9.2023 um 23:34 schrieb Loukuins:

I do and limiting the FPS back to my Refresh rate make the game more smoother and disabling V-Sync help too !

Sorry for that maybe dumb question - but what is the correct limit for the refresh rate? For example, i've set my quest 2 to 120hz so is the limit 60 or 120? because 60per eye?

[Hiob]

27 minutes ago, LOW_Hitman said:

Sorry for that maybe dumb question - but what is the correct limit for the refresh rate? For example, i've set my quest 2 to 120hz so is the limit 60 or 120? because 60per eye?

Refresh rate doesn't divide like that. Resolution does, but refreshrate not.

One is "per space", the other is "per time".

60Hz per Eye is 60Hz overall. 

[LOW_Hitman]

vor 5 Minuten schrieb Hiob:

Refresh rate doesn't divide like that. Resolution does, but refreshrate not.

One is "per space", the other is "per time".

60Hz per Eye is 60Hz overall. 

ok so if i set 120 as fps limit within the graphics.lua or/and nividia control panel it should be correct?

[Hiob]

I doubt that any VR-setup will reliable produce 120Hz in DCS, but other than that - it should.

[Loukuins]

4 hours ago, LOW_Hitman said:

Sorry for that maybe dumb question - but what is the correct limit for the refresh rate? For example, i've set my quest 2 to 120hz so is the limit 60 or 120? because 60per eye?

I don't uses VR Headset so I don't know sorry :c

[Ragnaroek]

Thanks for the inputs and sorry for my late reply - I am not often home these days due to work.

I tried to set the Nvidia control to a fixed refreshrate but couldn’t find the grafic.lua 

is it in saved games or in the main folder?

what I tried till now didn’t solve it 

[Loukuins]

On 9/7/2023 at 7:51 AM, Ragnaroek said:

Thanks for the inputs and sorry for my late reply - I am not often home these days due to work.

I tried to set the Nvidia control to a fixed refreshrate but couldn’t find the grafic.lua 

is it in saved games or in the main folder?

what I tried till now didn’t solve it 

You need to add a autoexcec.cfg in your config file (the one in saved games\DCS(.Openbeta)\ 
and then add this command and put the right fps limit : 
options.graphics.maxfps = "174"

[Ragnaroek]

Thanks! I hope I understood your instructions correctly and will try it out next time I‘m home (2 weeks). And it’s written „autoexcec.cfg“?

[Loukuins]

"autoexec.cfg" I didn't saw that I made a mistake 

11 hours ago, Ragnaroek said:

Thanks! I hope I understood your instructions correctly and will try it out next time I‘m home (2 weeks). And it’s written „autoexcec.cfg“?