How long does it take for an Item that you’ve just loaded to become visible? Answering this question allows for a way to detect what some users would perceive as "frame drops". I write that in quotes because Qt Quick only draws frames when needed, meaning it doesn't drop frames; but it can show them later than one would expect. That is what we would like to identify: When components are drawn late, and by how many milliseconds or frames are they late?

I've come up with a simple solution - code below the article - on how to measure this. Items being measured must inherit a class based of QQuickItem that has a connection on QQuickItem::visibleChanged . Its visible property should be false by default. When visible becomes true, a slot will start measuring elapsed time and create a direct connection to QQuickWindow::afterFrameEnd .…