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Fixed in Unity 2019.2



Found in


Issue ID




[VR]EarlyUpdate.XRUpdate's CPU usage increases by about 2.4ms every 10minutes if the Unity Player isn't focused on




Priority: 1Fix for next beta/patch release build


Severity: 3Secondary functionality broken

Steps to reproduce:

1. Create a new project
2. Enable VR
3. Build for standalone with "Development Build" and "Auto-Connect Profiler"
4. Run the build with an HMD attached
5. Open the profiler window
6. Make sure it is connected to the player
7. Leave the player running while unfocused for at least 20 minutes

Result: CPU usage spikes start occurring, player becomes laggy and continues to become worse as time goes on

Reproduced on 2017.4.0f1, 2017.4.17f1 2018.3.1f1, 2019.1.0a13

Response avatar

Resolution Note:

Fixed in 2018.3.10f1

Comments (28)

  1. Efe79f65b219936f2d04856fe29b09ac?d=mm


    Apr 16, 2019 13:06

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  2. 55254827963769e516617ee2c0688900?d=mm


    Mar 20, 2019 12:19

    My CPU hits 100% now. As a streamer I cannot have the game window always focused and I see the CPU increase on Unity games to the point that it destroys the frame rate in the HMD. I had to stop my stream today because of this issue. Please fix.

  3. F08983fcdf45e87ec3c3fd74ab302450?d=mm


    Mar 13, 2019 07:46

  4. F08983fcdf45e87ec3c3fd74ab302450?d=mm


    Mar 12, 2019 14:03

    This is an absolutely gamebreaking bug for us and people are giving us negative steam reviews & refunds because of this. PLEASE can we get this fix in 2018.3? Upgrading to 2018.3 has already probably cost us about a month of development time, we can't afford to do another full version upgrade.

  5. Ee1bc1d8b64c017e8213f138b7766c8f?d=mm


    Mar 12, 2019 11:35

    Another request for backport

  6. 103bfd00464041cc3415de0f801e16bb?d=mm


    Mar 04, 2019 01:49

    Please backport this fix to 2018.3. We really need this to be fixed for our application to work as intended.

  7. 71b782df09c648418c3dac69e66ac78b?d=mm


    Feb 25, 2019 01:24

    I see this is marked as resolved in 2019.2. Is there any change 2018.2 or 2018.3 is going to get this fix backported? We are like 2 months out from launch and would prefer not to have to launch on an Alpha branch of Unity...

  8. 103bfd00464041cc3415de0f801e16bb?d=mm


    Feb 21, 2019 06:52

    I tried the QualitySettings.SetQualityLevel approach. Sadly, I wasn't able to get EarlyUpdate.XRUpdate's CPU usage to normalize.

  9. 103bfd00464041cc3415de0f801e16bb?d=mm


    Feb 21, 2019 01:53

    Thank you so much for the detailed explanation!
    I hope this problem gets fixed in the near future. In the meantime, we're glad about any hint about how to possibly improve the situation (even if it's just a hackaround).

  10. 71b782df09c648418c3dac69e66ac78b?d=mm


    Feb 20, 2019 13:11

    Also I should note it's entirely possible this is dependent on a bunch of stuff (I haven't tested the Quality Settings switch fix in an empty project for example, so maybe if the game is large enough with enough going on at once there is some sort of clearing or the big hiccup causes it to "reset"). Just making a note of it in case that helps the Unity folks track it down better.

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