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    Very low fps in VR

    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.

    #2
    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.
    i7 9700K @ stock speed, single GTX1070, 32 gigs of RAM, TH Warthog, MFG Crosswind, Win10.

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      #3
      Because of the poor optimization of DCS. DCS only runs one CPU core for sim. The DCS engine is too outdated.

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        #4
        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.





        Forum rules - DCS Crashing? Try this first - Cleanup and Repair - Discord BIGNEWY#8703 - Youtube - Patch Status

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          #5
          Originally posted by Jim keller View Post
          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 The DCS engine is too outdated.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.


          Forum rules - DCS Crashing? Try this first - Cleanup and Repair - Discord BIGNEWY#8703 - Youtube - Patch Status

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            #6
            Originally posted by BIGNEWY View Post
            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%.

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              #7
              Originally posted by BIGNEWY View Post

              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.
              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.

              Comment


                #8
                Originally posted by Art-J View Post
                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.

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                  #9
                  Originally posted by Jim keller View Post

                  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


                  Forum rules - DCS Crashing? Try this first - Cleanup and Repair - Discord BIGNEWY#8703 - Youtube - Patch Status

                  Comment


                    #10
                    Originally posted by mg20101 View Post
                    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.
                    SATAL : "Summary - Tomcat limited to 2 AIM-54A mk74 Phoenix per aircraft for both Diamond and Gold leagues. All other Phoenix types, AIM-54A mk60 and AIM-54C, are currently banned."

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                      #11
                      Originally posted by Csgo GE oh yeah View Post

                      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?

                      sigpicDigital Storm Lynx: i9-10850k (5.2 GHz): 64GB RAM (3200 MHz): 2TB SSD M.2 Samsung 970 EVO: 2TB Samsung HD: GEFORCE 2080 TI: Thrust Master WartHog (modified): TM F-18C joystick: Saitek Rudder Pedals: HP Reverb PRO: Volair Sim Cockpit: IRL Retired Maintainer of the AT-38B: F-4E/G: F-15A/B/C/D: and McDonnell Douglas/Boeing Technical Advisor for the F-15C/D. I drive trains now.

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                        #12
                        On, most definately probably i think . It seems to 'lock' fps at 45 most of the time
                        SATAL : "Summary - Tomcat limited to 2 AIM-54A mk74 Phoenix per aircraft for both Diamond and Gold leagues. All other Phoenix types, AIM-54A mk60 and AIM-54C, are currently banned."

                        Comment


                          #13
                          Originally posted by Csgo GE oh yeah View Post

                          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.

                          Comment


                            #14
                            Originally posted by kdrum60 View Post

                            Do you have reprojection ON or OFF in SteamVR?
                            I have reprojection ON.

                            Comment


                              #15
                              Originally posted by mg20101 View Post

                              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
                              SATAL : "Summary - Tomcat limited to 2 AIM-54A mk74 Phoenix per aircraft for both Diamond and Gold leagues. All other Phoenix types, AIM-54A mk60 and AIM-54C, are currently banned."

                              Comment

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