Details
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Bug
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Resolution: Fixed
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P1: Critical
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6.6.1, 6.6.2, 6.6, 6.7.0 Beta1, 6.7.0 Beta2
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None
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macOS Sonoma 14.3 Apple Silicon M1
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macOS
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a86321cb6 (dev), c374e5127 (6.7), 0b474e1b4 (6.6)
Description
Moving from Qt 6.2.4 to Qt 6.6 on macOS showed a huge performance degradation with using `QTreeView::expandAll()` on a tree view with approx. 92k items.
Following discussion on the forum identified this change as the cause for the degradation.
Removal of `resetModelIfNeeded` restores the performance of `expandAll()` from *47 seconds* back down to below a second.
Attached is the forum's testcase which creates a treeview with 92k items. Clicking on expand button takes 40+ seconds on macOS. Detailed timings are provided in the forum post as well as screenshots tracing Qt with Apple Instruments.
Attachments
| For Gerrit Dashboard: QTBUG-122054 | ||||||
|---|---|---|---|---|---|---|
| # | Subject | Branch | Project | Status | CR | V |
| 538685,2 | QTreeView: fix performance regression from accessibility updates | dev | qt/qtbase | Status: MERGED | +2 | 0 |
| 538961,2 | QTreeView: fix performance regression from accessibility updates | 6.7 | qt/qtbase | Status: MERGED | +2 | 0 |
| 539086,3 | QTreeView: fix performance regression from accessibility updates | 6.6 | qt/qtbase | Status: MERGED | +2 | 0 |