Very low fps in VR

[mg20101]

Hi, I played the game at the same resolution and at the same level of graphics settings with both the VR 4k headset and the 4k monitor. On the monitor the game reaches 120 fps while on the VR headset it barely reaches 45. Why is there this difference in performance between VR and the monitor at the same resolution? I use an i7 8700k processor and an RTX 3090 graphics card.

[Art-J]

In short - because in VR, for stereo rendering and depth perception the game must display two similar, but still slightly different 4K frames (compared to one on flat screen), pretty much doubling the work that CPU and GPU have to do.

[BIGNEWY]

Hi

 

Which headset are you using?

 

if it uses steam vr what is the steam vr resolution set to? If it is much higher than your native resolution it will affect frame rate.

 

what is your dcs settings in vr, if you have them maxed in vr you will have problems.

 

 

 

 

[BIGNEWY]

Because of the poor optimization of DCS. DCS only runs one CPU core for sim. The DCS engine is too outdated.

 

DCS was here long before VR and we have added VR after the fact, we are working on improvements, but until we can test vulkan we will not know if it will help or not.

[mg20101]

Hi

 

Which headset are you using?

 

if it uses steam vr what is the steam vr resolution set to? If it is much higher than your native resolution it will affect frame rate.

 

what is your dcs settings in vr, if you have them maxed in vr you will have problems.

 

 

 

 

I use HP Reverb G1. My Steam VR resolution is set to 100%.

[mg20101]

In short - because in VR, for stereo rendering and depth perception the game must display two similar, but still slightly different 4K frames (compared to one on flat screen), pretty much doubling the work that CPU and GPU have to do.

 

This is probably the main reason for the low performance in VR.

[BIGNEWY]

 

Thanks for your reply. Maybe I am too emotional. As a DCS gamer for 5 years I have so many expectation on that sim, although she is not perfect, I have never consider to give it up.

 

thanks for sticking with us, I am hopeful for vulkan, the amount of work going into to it is huge and the team are working hard. Fingers crossed for positive test results when we get to it.

 

thanks

[Csgo GE oh yeah]

Hi, I played the game at the same resolution and at the same level of graphics settings with both the VR 4k headset and the 4k monitor. On the monitor the game reaches 120 fps while on the VR headset it barely reaches 45. Why is there this difference in performance between VR and the monitor at the same resolution? I use an i7 8700k processor and an RTX 3090 graphics card.

 

Resolution and supersampling do matter, but not as much as you think (maybe). I play at 300% supersampling (also with reverb) with a 3080. I think you can easily crank up your supersampling , because right now at 100% your CPU is most likely the bottleneck

 

 

So if you're aiming for 90 fps, i'm pretty sure you can forget all about that.

But at least you can crank up the visuals, and still be at 45 fps .

And you should definitely overclock the living crap out of that 8700k if you haven't already.

[Bulldog_1]

 

Resolution and supersampling do matter, but not as much as you think (maybe). I play at 300% supersampling (also with reverb) with a 3080. I think you can easily crank up your supersampling , because right now at 100% your CPU is most likely the bottleneck

 

So if you're aiming for 90 fps, i'm pretty sure you can forget all about that.

But at least you can crank up the visuals, and still be at 45 fps .

And you should definitely overclock the living crap out of that 8700k if you haven't already.

 

Do you have reprojection ON or OFF in SteamVR?

 

 

[Csgo GE oh yeah]

On, most definately probably i think . It seems to 'lock' fps at 45 most of the time

[mg20101]

 

Resolution and supersampling do matter, but not as much as you think (maybe). I play at 300% supersampling (also with reverb) with a 3080. I think you can easily crank up your supersampling , because right now at 100% your CPU is most likely the bottleneck

 

 

So if you're aiming for 90 fps, i'm pretty sure you can forget all about that.

But at least you can crank up the visuals, and still be at 45 fps .

And you should definitely overclock the living crap out of that 8700k if you haven't already.

 

I set the VR headset from 90 Hz to 60 Hz. I manage to run the game smoothly at maximum settings like this.

[mg20101]

 

Do you have reprojection ON or OFF in SteamVR?

 

 

I have reprojection ON.

[Csgo GE oh yeah]

 

I set the VR headset from 90 Hz to 60 Hz. I manage to run the game smoothly at maximum settings like this.

 

yeah i notice light flickering when i do that unfortunately

[mg20101]

 

yeah i notice light flickering when i do that unfortunately

 

They recently did an update for WMR and now it works much better on 60 Hz than before, but really the screen flashes a bit compared to 90 Hz.

[Csgo GE oh yeah]

Game engine is just too old i guess, you will never get half decent performance in VR and multiplayer .
Unless ones expectations of graphics and fps are really low , better to stick with 2d singleplayer. 
Unfortunately singleplayer is not my cup of tea.