Performance VR - MT - Stable

[LOW_Hitman]

Hi all,

yesterday i tried the MT Version of DCS in VR. The worst performance i've ever seen in this game. My FPS went down about 50% from around 60 - 70 to 30-40 in the same scenarios.

Everyone else who have seen this, or is there something i missed to change in the settings? ( i changed no settings only switched from ST to MT Version by starting the bin-mt.exe.

Best regards - Martin

[Mr_sukebe]

Have you emptied your FXO and Metashader folders?

[LOW_Hitman]

yes serveral times deleted fxo and metashader2 - didn't helped

[LOW_Hitman]

After another round of testing i figured out some strange performance issues. When i set up a profile within oculus tray tool for dcs and set "CPU-Priority" to high i get massive more fps and less stutters.

When i turn this setting to default my fps are capped and i get stutters at 45fps or less - with high - not capped and jump up to 65-70 fps

Overall no performance win when using the MT Version (Hyperthreading on, etc.)

 

Edited May 7, 2023 by LOW_Hitman

[kerlcat]

Any chance to try to start DCS without any toolkit and ensure it's running with runtime of "Oculus"?

I got a boost like 20% of fps gain by switching from ST to MT and no stuttering at all now. Of coz it might differ from each person's HW or config

[LOW_Hitman]

vor 6 Stunden schrieb kerlcat:

Any chance to try to start DCS without any toolkit and ensure it's running with runtime of "Oculus"?

I got a boost like 20% of fps gain by switching from ST to MT and no stuttering at all now. Of coz it might differ from each person's HW or config

Hi! What do you mean with "start without any toolkit"? You mean Traytool, etc.? So only the Oculus App after connecting via oculus link?

[LOW_Hitman]

Strange... i tried it again with Oculus Tray Tool but set "CPU Priority" for DCS-MT to "default" - now the fps are not capped. I'll try a few flights to see if the problem is solved. Thnx for your input!

[kerlcat]

Yes, MT should give a boost instead of drag by all means. So only assume some setting or unnecessary overlay other than OpenXR caused the cap you experienced. Anyway you could see if your changes could sustain. Good luck!

[LOW_Hitman]

Tested ST vs MT for hours yesterday. After your inputs i finally got MT runnin. But it doesn't run smooth. MT Version gives more FPS but dramatic "spikes"

For example - Mission SU25T Campain - hotstart on runway:

ST: gives 50-60 fps with low spikes runs very smooth - no microstutters ground moves clear and smooth as silk.

same scenario with MT: output 60-70 fps but heavy spikes and micro stutters - during take off i can see heavy mirco stutters when watching the ground.

Also a strange issue with MT - after a few minutes in flight (F16 and F14) i got dramatic tearing when i switch between cameras F1,F2, F3 - no chance to stop it (also Alt-Tab doesn't work)

For me and my setup i'll use ST - MT is not working and i have to say iam not willing to spend hours and hours to keep this new "feature" running.

Edited May 9, 2023 by LOW_Hitman

[BIGNEWY]

7 minutes ago, LOW_Hitman said:

Tested ST vs MT for hours yesterday. After your inputs i finally got MT runnin. But it doesn't run smooth. MT Version gives more FPS but dramatic "spikes"

For example - Mission SU25T Campain - hotstart on runway:

ST: gives 50-60 fps with low spikes runs very smooth - no microstutters ground moves clear and smooth as silk.

same scenario with MT: output 60-70 fps but heavy spikes and micro stutters - during take off i can see heavy mirco stutters when watching the ground.

Also a strange issue with MT - after a few minutes in flight (F16 and F14) i got dramatic tearing when i switch between cameras F1,F2, F3 - no chance to stop it (also Alt-Tab doesn't work)

For me and my setup i'll use ST - MT is not working and i have to say iam not willing to spend hours and hours to keep this new "feature" running.

 

attach your dcs log we may see clues. 

also ensure hotplug is disable in controls, it is often the cause of some stutter. 

[LOW_Hitman]

vor 3 Minuten schrieb BIGNEWY:

attach your dcs log we may see clues. 

also ensure hotplug is disable in controls, it is often the cause of some stutter. 

Thanks! Hotplug is set to off.

dcs.log

[kerlcat]

Can I ask which hotplug to be set to off? Though I don't have stuttering issue with MT, still would like to see if it's benefitial in more ways. 

[BIGNEWY]

16 minutes ago, LOW_Hitman said:

Thanks! Hotplug is set to off.

dcs.log 158.92 kB · 1 download

Can I ask you to try something 

C:\Users\marti\Saved Games\DCS

rename to C:\Users\marti\Saved Games\DCSbackup

then run a slow repair of DCS or verify if steam

 

The restart DCS and login, ( fist load will take longer due to shader creation ) 

then test without any unofficial mods or added scripts from apps. 

 

do you notice a difference in MT after this test?

[LOW_Hitman]

vor 13 Minuten schrieb BIGNEWY:

Can I ask you to try something 

C:\Users\marti\Saved Games\DCS

rename to C:\Users\marti\Saved Games\DCSbackup

then run a slow repair of DCS or verify if steam

 

The restart DCS and login, ( fist load will take longer due to shader creation ) 

then test without any unofficial mods or added scripts from apps. 

 

do you notice a difference in MT after this test?

i'll try it - thnx for your fast response!!

[LOW_Hitman]

vor 34 Minuten schrieb kerlcat:

Can I ask which hotplug to be set to off? Though I don't have stuttering issue with MT, still would like to see if it's benefitial in more ways. 

In Controll settings there is a button at the lower right - enable hotplug - i disabled this a few months ago after performance issues.

[LOW_Hitman]

vor 44 Minuten schrieb BIGNEWY:

Can I ask you to try something 

C:\Users\marti\Saved Games\DCS

rename to C:\Users\marti\Saved Games\DCSbackup

then run a slow repair of DCS or verify if steam

 

The restart DCS and login, ( fist load will take longer due to shader creation ) 

then test without any unofficial mods or added scripts from apps. 

 

do you notice a difference in MT after this test?

tested - MT runs with more fps than ST but its not as smooth as it is in ST. Little microstutters. F16 and F14 for example runnin terrible in MT compared to ST.

Attached find a fresh log from test after restored backup.

dcs.log

[BIGNEWY]

58 minutes ago, LOW_Hitman said:

tested - MT runs with more fps than ST but its not as smooth as it is in ST. Little microstutters. F16 and F14 for example runnin terrible in MT compared to ST.

Attached find a fresh log from test after restored backup.

dcs.log 53.25 kB · 0 downloads

try increasing your page file 

Pagefile: 16384 MB, increase it to 32682 MB and see if you notice a difference. 

Also are you using motion smoothing? try with and without 

[LOW_Hitman]

Gerade eben schrieb BIGNEWY:

try increasing your page file 

Pagefile: 16384 MB, increase it to 32682 MB and see if you notice a difference. 

Also are you using motion smoothing? try with and without 

Ok i'll try it - a fixed pagefile is better than a windows managed for dcs iam right? Iam using no openxr toolkit or something - only DCS with the oculus quest 2 software and the oculus tray tool - there is no option or setting for motion smoothing as far as i know.

thnx for your help!

[BIGNEWY]

Just now, LOW_Hitman said:

Ok i'll try it - a fixed pagefile is better than a windows managed for dcs iam right? Iam using no openxr toolkit or something - only DCS with the oculus quest 2 software and the oculus tray tool - there is no option or setting for motion smoothing as far as i know.

thnx for your help!

yes a larger fixed pagefile is better. 

In oculus its called ASW I believe reference motion smoothing. ( Asynchronous Spacewarp )

[LOW_Hitman]

vor 25 Minuten schrieb BIGNEWY:

yes a larger fixed pagefile is better. 

In oculus its called ASW I believe reference motion smoothing. ( Asynchronous Spacewarp )

ah ok - yes this is always OFF - because on gives abnormal stutters.

[BIGNEWY]

can you send me your dxdiag also, we can look there for clues 

thanks

[LOW_Hitman]

vor 41 Minuten schrieb BIGNEWY:

can you send me your dxdiag also, we can look there for clues 

thanks

i've sent a private message including the dxdiag file

[Temetre]

Ill try some of the suggestions in this thread. Just some observations from a bunch of testing:

Using a Pico4 for VR, now with a new GPU making me fully CPU bottlenecked, MT produces a LOT of microstutter. Its an issue as well in ST, but its much worse in MT. Its most notable in extremely jittery head movement. Turning head, moving it sideways is super jittery with constant overshooting.

Its actually so extreme that the FPS-viewer shows framerate jumping between 40 and 80fps with ground action close to me, frametime graph looks like a rollercoaster sometimes (no ASW/smoothing active). Im still trying to analyze where the issues is coming from (planning to try process lasso, bigger pagefile).

This is mostly an issue in reasonably big battles, on a smaller scale with higher fps its better. But even on an empty Syria flying the FPS is sometimes just 60-80 fps, and very minor jitter. The CPU is an I5-12400, which is a fairly strong CPU in other games. GPU is 6800 XT, tho Ive noticed the game managed to fill up 16gb of VRAM with high/high textures? Less V-memory usage didnt fix the issue tho.

One peculiar thing is that while frametimes remain slightly rough, in non-VR big battles in DCS are way more smooth and higher framerate.

Edited May 10, 2023 by Temetre

[Temetre]

Increasing pagefile to 32 gigs didnt fix the issue, neither did process lasso setting priorities to high. No meaningful change enabling/disabling use of HT cores. Apparently DCS was set to "lower than normal" priority for some reason? Increasing to high didnt fix the issue tho.

Here a quick and dirty screenshot. This isnt a sanitized scenario, no point sending a trackfile i think. Last liberation mission, me on the runway, planes spawning in the air, friendly/enemy vehicles fighting closely. Also EWRS/splash damage script running, tho no IADS. Good extreme case test. Look at the frametimes, gues from 8ms to 40ms or so.

This is a big mission, but smaller missions and even solo flights show this problem to a smaller degree.

Spoiler

@BIGNEWYWhats best I can do to get help? Set up a simpler scenario with a trackfile?

Also just to be safe, in case its useful, Im PM'ing you my settings+dxdiag.

 

Edited May 10, 2023 by Temetre

[BIGNEWY]

short tracks showing a problem help, but we can not use unofficial mods, it will not work when we go to debug versions