Vr fps lock

[Toga10]

Hello all. 

Recently I upgraded my system to something I thought would run dcs in vr fine, But for some reason fbs seems to be locked at 36fps. It doesn't matter what mission or weather it's mp or not, once I got a stable 72fps in the hoggit training server. This was on the same settings as before (I use the dcs vr preset). The any suggestions on improving fps would be appreciated, my specs are below. 

I7-12700k

Rtx 3070

32gb ddr4 ram 3200

Dcs is on an ssd

Oculus quest 2

Windows 11

[edmuss]

You have ASW enabled which will lock it down to half refresh rate unless you can beat the refresh rate (72Hz + a little overhead).  ASW works by rendering at half refresh rate (36Hz in this case) and generating synthetic frames to interpolate to alleviate GPU load, these synthetic frames make it appear as though you are achieving refresh rate of 72Hz so the image is smooth, however it can introduce some visual artifacts.  If the image is smooth then don't worry too much about it.

If you disable ASW it should display the actual framerate that your GPU can output, however it may well be less smooth.  I would hazard a guess that you should be around 55-65fps on Caucasus and 45-60fps on Syria.  With ASW enabled it will only ever display as 72 or 36 when using steamvr or the oculus runtime; if you switch to the openxr translator mod then it should release some additional performance and smooth things out.

For reference my system isn't a million miles from yours and I run openxr on my G2 at just under 90% resolution, high textures, medium everything else with low/flat shadows, no MSAA, tree/building factors at 0.7 (using Taz's tree mods) and can get pretty reliably get 70fps on Caucasus in the A10C or KA50.  I don't use reprojection (openxr equivalent of ASW) as I don't like the visual artifacting and openxr is very much smoother than steamvr.

[Toga10]

3 hours ago, edmuss said:

You have ASW enabled which will lock it down to half refresh rate unless you can beat the refresh rate (72Hz + a little overhead).  ASW works by rendering at half refresh rate (36Hz in this case) and generating synthetic frames to interpolate to alleviate GPU load, these synthetic frames make it appear as though you are achieving refresh rate of 72Hz so the image is smooth, however it can introduce some visual artifacts.  If the image is smooth then don't worry too much about it.

If you disable ASW it should display the actual framerate that your GPU can output, however it may well be less smooth.  I would hazard a guess that you should be around 55-65fps on Caucasus and 45-60fps on Syria.  With ASW enabled it will only ever display as 72 or 36 when using steamvr or the oculus runtime; if you switch to the openxr translator mod then it should release some additional performance and smooth things out.

For reference my system isn't a million miles from yours and I run openxr on my G2 at just under 90% resolution, high textures, medium everything else with low/flat shadows, no MSAA, tree/building factors at 0.7 (using Taz's tree mods) and can get pretty reliably get 70fps on Caucasus in the A10C or KA50.  I don't use reprojection (openxr equivalent of ASW) as I don't like the visual artifacting and openxr is very much smoother than steamvr.

thank you very much for the input, how do i disable ASW and whats openXR translator mod?

[edmuss]

I have no idea, it should be somewhere in the oculus settings I would imagine.

The openxr translator has been developed for WMR headsets specifically but has been applied to most others as well.  There are some specifics to setting it up with the quest but I believe it's all in that thread, use the search function and you should get some results about it in there

 

[Outlaw]

You can disable it via oculus debug tool (it's in the oculus software installation folder) or can be disabled via oculus tray tool (you will have to download). 

 

 

[Toga10]

im not sure if it is this, sometimes it struggles to maintain that 30fps its stuttery and sometimes the head tracking Dsyncs causing me to get really motion sick if anyone can help that would be great

 

[PLUTON]

sir edmuss a simple question please?
When you say that my G2 has a resolution slightly lower than 90%, do you do this setting or exactly?
Thank you in advance for your answer

[edmuss]

23 hours ago, Toga10 said:

im not sure if it is this, sometimes it struggles to maintain that 30fps its stuttery and sometimes the head tracking Dsyncs causing me to get really motion sick if anyone can help that would be great

 

If your GPU can't achieve half of the refresh rate (when running steamvr or oculus runtimes) plus a little overhead it will disable ASW and it will get very janky. If you're running at 72Hz then that means you would need to be achieving around 40fps to keep ASW running.

The openxr runtime has a massive advantage with it's reprojection in that it can also at 1/3 and 1/4 of refresh rate of need be and can keep it much smoother at lower framerates.

Make sure your rig is fully optimised, have a look at Thuds blog for tuning and then go through all the rest of your settings as you should be able to get better performance than you are.

36 minutes ago, PLUTON said:

sir edmuss a simple question please?
When you say that my G2 has a resolution slightly lower than 90%, do you do this setting or exactly?
Thank you in advance for your answer

All VR headsets have a native resolution that they're designed to run at.

You can scale the rendered image to be larger (supersampling) than this which results in generally better image quality but worse performance.

Alternatively...

You can scale the rendered image to be smaller (undersampling) than this which results in generally worse image quality but better performance.

The G2 has a render resolution on 3176 pixels wide at 100%. Currently I run at 2900 pixels wide (set using the resolution override in the openxr toolkit ingame menu) which is a little over 90% resolution (2900/3176x100=91.3%). The amount you supersample or undersample is entirely up to you based on your requirements and system performance.

Edited June 28, 2022 by edmuss

[PLUTON]

I'm going to bother you a little more Mr. Edmus,
would it be possible to have a screenshot of the exact location?
setting in open xr?
If yes thank you in advance it would help me a lot

[PLUTON]

I gained 6fps by disabling grass on all maps and 10 fps on SA, since then I taxi and take off on SA at 15fps instead of 5 fps
then as soon as I reach 300 feet I turn to 30 lock
while waiting for the optimization of SA it is always that of winning.
If it can help other pilots!!
Have a nice flight everyone

[dburne]

1 hour ago, PLUTON said:

I gained 6fps by disabling grass on all maps and 10 fps on SA, since then I taxi and take off on SA at 15fps instead of 5 fps
then as soon as I reach 300 feet I turn to 30 lock
while waiting for the optimization of SA it is always that of winning.
If it can help other pilots!!
Have a nice flight everyone

And SA is what exactly? I am not too well versed in all the nomenclatures used these days. As a flight sim enthusiast only thing comes to my mind when seeing SA is situational awareness...

Edited June 29, 2022 by dburne

[PhoenixRising]

I believe they are referring to the new South Atlantic map.

Sent from my moto g stylus 5G using Tapatalk

[dburne]

1 minute ago, PhoenixRising said:

I believe they are referring to the new South Atlantic map.

Sent from my moto g stylus 5G using Tapatalk
 

Ahh ok thanks - take note to self.

[PLUTON]

Yes sorry for my abbreviations
S.A = South. Atlantic

[PLUTON]

I tried unlocking the fps
in the nvidia setting I replaced the setting (at half the frequency of the monitor) by setting (fast)
and I was surprised to see my fps increased which is logical but above all to have a very fluid image without stuttering on South Atlantic.

so much better

[dburne]

31 minutes ago, PLUTON said:

I tried unlocking the fps
in the nvidia setting I replaced the setting (at half the frequency of the monitor) by setting (fast)
and I was surprised to see my fps increased which is logical but above all to have a very fluid image without stuttering on South Atlantic.

so much better

I have been setting that to Fast for some time now, did not know if it was maybe placebo but seems I got better performance with it.

[PLUTON]

Now what would be good is that RAZBAM
optimizes the South Atlantic maps thank you in advance Razbam

PLEASE PLEASE PLEASE

[Venom8T3]

I have same issue on my Q3 , ASW is OFF and using Openxr all set up correctly. will be running fine at 70fps, as soon as I try jump in anything automatically crashes to 36fps and locks itself there.

even with the settings dropped to bare minimum still same..

 

3700x

3070ti

32gb ram ddr4 (3600mhz)

DCS is on its own SSD

Meta quest 3

Openxr open and asw is off

Win 10

[4romeodelta]

On 6/25/2024 at 2:51 PM, Venom8T3 said:

I have same issue on my Q3 , ASW is OFF and using Openxr all set up correctly. will be running fine at 70fps, as soon as I try jump in anything automatically crashes to 36fps and locks itself there.

even with the settings dropped to bare minimum still same..

 

3700x

3070ti

32gb ram ddr4 (3600mhz)

DCS is on its own SSD

Meta quest 3

Openxr open and asw is off

Win 10

I have similar experience with my Q3.  Mission (or instant action or campaign) will start at 72 FPS with no stutter. Later in the flight the FPS drops to 36, even in low detail environments. Would love to figure out how to lock at 72 if anyone has a tip or two!!

[Qcumber]

1 hour ago, 4romeodelta said:

I have similar experience with my Q3.  Mission (or instant action or campaign) will start at 72 FPS with no stutter. Later in the flight the FPS drops to 36, even in low detail environments. Would love to figure out how to lock at 72 if anyone has a tip or two!!

If you use Oculus Tray Tool you can set key bindings to disable auto ASW or to force to 36 fps plus other options. However, if your system cannot sustain 72 fps, and you disable auto FPS, you will get sub 72 fps which is likely to cause stuttering. 

[4romeodelta]

18 hours ago, Qcumber said:

If you use Oculus Tray Tool you can set key bindings to disable auto ASW or to force to 36 fps plus other options. However, if your system cannot sustain 72 fps, and you disable auto FPS, you will get sub 72 fps which is likely to cause stuttering. 

I have seen auto FPS referenced in MSFS threads. Is it used in DCS as well? 

[Qcumber]

You can set a maximum FPS in DCS but I have personally not found this useful. I aim for 72 FPS and toggle auto on and off depending on my needs, sometimes down to 36 with reprojection (ASW).