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  1. Qt
  2. QTBUG-84414

REG: performance regression in qml text delegates

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    Description

      A ~14% performance regression has been seen in qmlbench between 5.12 and 5.15.

      Tests affected:

      benchmark
      delegates_longtext.qml
      delegates_textinput.qml
      delegates_textfield.qml
      delegates_textarea.qml
      delegates_textedit.qml

       

      It appears that a performance improvement entered 5.12/dev around 21-Mar-2019 and was then reverted on dev, leaving a performance gap between 5.12 and later branches 5.14 and 5.15.

       

      See: https://testresults.qt.io/grafana/d/5ei7yHViz/qmlbench-unlocked-dashboard?viewPanel=146&orgId=1&var-suite=All&var-benchmark=All&var-branch=5.15&var-branch=5.14&var-branch=5.13&var-branch=5.12&var-branch=dev&var-hardwareId=Ubuntu_16.04_Foucault_x64&from=1549473496820&to=1570980123832

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            qt.team.quick.subscriptions Qt Quick and Widgets Team
            daniel.smith Daniel Smith
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              Updated:

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