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Votes

5

Found in

2018.3.0f1

2019.1.0a13

2019.4

2020.1

2020.2

Issue ID

1108469

Regression

Yes

Gfx.WaitForPresent / Gfx.WaitForPresentOnGfxThread huge spikes in Profiler when in Play Mode with vSync set to "Don't Sync"

Graphics - LowLevel

-

Steps to reproduce:
1. Open a new project
2. Turn off vSync (Project Settings > Quality > Other > VSync Count > Don't Sync)
3. Open the Profiler (makes it easier if only Rendering activity is showing in CPU Usage, located in Window > Analysis > Profiler)
4. Enter the Play Mode
5. Observe the Profiler Window

Expected results: no Gfx.WaitForPresent spikes are visible
Actual result: constant Rendering spikes for Gfx.WaitForPresent

Reproduced with: 2019.1.0a13, 2018.4.26f1, 2019.4.7f1, 2020.1.1f1, 2020.2.0a20
Not reproducible: 2019.1.0a12 Mac (but still somewhat reproducible on Windows)

Reproduced on:
MacBook Pro 10.13.6 with Metal API
iMac 2017 10.15.6 with Metal API
Windows 10 with DX11, DX12, Vulkan, OpenGLCore

Not reproducible:
MacBook Pro 10.13.6 with OpenGLCore
iMac 2017 10.15.6 with OpenGLCore

Notes:
1. Happens very rarely when vSync is on. Happens way more frequently on Mac compared to Windows.
2. Performance deteriorates when moving the mouse in Play Mode

  1. Resolution Note:

    try to use Time.smoothDeltaTime instead of Time.deltaTime in user's script, also in quality settings, change Vsync to "Every V Bank"

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Comments (7)

  1. kevinh3682

    Aug 03, 2024 15:20

    I'm having this problem on 2022.3.6.f1

  2. imrankhanswati

    Jan 23, 2019 05:52

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

  3. imrankhanswati

    Jan 23, 2019 05:51

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

  4. imrankhanswati

    Jan 23, 2019 05:50

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

  5. imrankhanswati

    Jan 23, 2019 05:50

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

  6. imrankhanswati

    Jan 23, 2019 05:50

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

  7. imrankhanswati

    Jan 23, 2019 05:50

    I am also experiencing same issue with 2018.2. GFX spike is shown after constant specific time. it usually takes like 60%+.

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