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  1. Qt
  2. QTBUG-85663

Very poor performance drawing QSlider ticks on MacOS

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    • Icon: Bug Bug
    • Resolution: Unresolved
    • Icon: P4: Low P4: Low
    • None
    • 5.15.0
    • Widgets: Widgets and Dialogs
    • None
    • macOS

      On Mac Os, when using a QSlider with tick marks enabled, the performance drops significantly. I attached a sample program to verify this. It has a slider and using a timer tries to move the slider 100 times per second. On Windows and Ubuntu this easily works with up tp 10000 tick marks. On MacOS the update rate drops to 60 fps for 100 ticks and to 3 fps for 1000 ticks.

       

      Possibly related but not identical Issues:

      https://bugreports.qt.io/browse/QTBUG-48084?jql=text%20~%20%22qslider%22
      https://bugreports.qt.io/browse/QTBUG-682?jql=text%20~%20%22qslider%22
      https://bugreports.qt.io/browse/QTBUG-49385?jql=text%20~%20%22qslider%22

        1. main.cpp
          0.2 kB
          Christian Feldmann
        2. SliderTest.pro
          0.2 kB
          Christian Feldmann
        3. SliderWidget.cpp
          1.0 kB
          Christian Feldmann
        4. SliderWidget.h
          0.5 kB
          Christian Feldmann
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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            ChristianFeldmann Christian Feldmann
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              Created:
              Updated:

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