Details
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Bug
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Resolution: Done
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P1: Critical
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5.10.1, 5.12.0
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None
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77a4915bf900aac0c96260018c0a4ccfbdd7c094 (qt/qtbase/5.12)
Description
When updating a label like ~30 times a second the user interface will freeze.
This issue is only detected on macOS Mojave.
I've created an Instruments log where you can see QImage is used frequently for updating just a label. See the attachment with the log. When the window will be made bigger or more elements are added, CPU will easily hit the 100% for a simple application. This also freezes the network elements etc.
Possibly it's affected on all versions of Qt. Tested on 5.10.1 and 5.12.0.