How Long Does It Take for a QQuickItem to Become Visible? Measuring Frame Delays in Qt Quick | KDAB

▤ Summary

This article explains how to measure the delay between making a QQuickItem visible and seeing it appear on screen in Qt Quick. It describes a C++ approach that combines visibleChanged, QQuickWindow::afterFrameEnd, and QQuickItem::ensurePolished to detect when the correct frame has been swapped into view. It also shows how to convert elapsed milliseconds into frame counts using the display refresh rate for a more consistent result. The piece includes implementation guidance for handling QML initialization behavior and recommends making items invisible by default in the constructor. It is positioned as a profiling and debugging technique for Qt developers building or tuning software rendering behavior.

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