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  1. Qt
  2. QTBUG-52372

QML Rendering performance issues with multiple windows

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P1: Critical P1: Critical
    • None
    • 5.6.0
    • GUI: Graphics Performance

      The attached project opens 16 Qt Quick windows. Each is of them displaying a small (27kb) image which is rotated by an RotationAnimator.

      I observe continuous frame drops. The animation is stuttering. With an increased windows size the issue already starts with 8 windows. CPU performance according to activity monitor is above 140%.

      Note: profiling didn't point to any obvious scene-related hotspots. Animations frame-rate is 60 fps. I see a lot of time spent in the SG swap state. The graphics card should be able to draw these scenes without frame-drops.

        1. image-2021-04-12-16-51-05-019.png
          110 kB
          Jarrod Smith
        2. image-2021-04-14-14-51-21-050.png
          62 kB
          Jarrod Smith
        3. MultiWindowQML_QSG_RENDER_LOOP_basic.qtd
          2.66 MB
          Holger Zwar
        4. MultiWindowQML.qtd
          6.72 MB
          Holger Zwar
        5. MultiWindowQML.zip
          28 kB
          Holger Zwar
        6. Qt6.8.4ProfileBuildTrace.qzt
          1.08 MB
          Luqiao Chen
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            vestbo Tor Arne Vestbø
            nihzwar Holger Zwar
            Veli-Pekka Heinonen Veli-Pekka Heinonen
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              Created:
              Updated:

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