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  1. Qt
  2. QTBUG-123343

High CPU usage when scrolling

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Details

    • Bug
    • Resolution: Unresolved
    • P2: Important
    • None
    • 6.6.2
    • Widgets: Itemviews
    • None
    • macOS

    Description

      On macOS with a QTreeView there is really high CPU usage when scrolling down, this has been an issue since Qt 5, over 60% is seen in Activity Monitor.

      Testing with a Mac Mini M2 with a Samsung UHD TV on resolution 3840 x 2160

      I was hoping this was fixed by https://codereview.qt-project.org/c/qt/qtbase/+/403699, but no difference.

      Some profiling has been done by a user: https://github.com/strawberrymusicplayer/strawberry/issues/542#issuecomment-698676102

      Other Qt programs like lyx (https://www.lyx.org/) seems to have the same issue.
      And others have seen the same behavior (https://forum.qt.io/topic/70017/cpu-usage-going-high-during-user-operation)

      Is it possible to improve this?

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            jonaski Jonas Kvinge
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            Dates

              Created:
              Updated:

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