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  1. Qt
  2. QTBUG-52372

QML Rendering performance issues with multiple windows

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    Details

    • Type: Bug
    • Status: Open
    • Priority: P1: Critical
    • Resolution: Unresolved
    • Affects Version/s: 5.6.0
    • Fix Version/s: None
    • Labels:
      None
    • Environment:

      Description

      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.

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              Assignee:
              vestbo Tor Arne Vestbø
              Reporter:
              nihzwar Holger Zwar
              PM Owner:
              Veli-Pekka Heinonen Veli-Pekka Heinonen
              Votes:
              5 Vote for this issue
              Watchers:
              13 Start watching this issue

                Dates

                Created:
                Updated:

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