https://bugs.kde.org/show_bug.cgi?id=386846

--- Comment #11 from David Edmundson <k...@davidedmundson.co.uk> ---
I've found our 5 second timer.

It'll be QPlatformWindow::requestUpdate which is called from
QWindow::requestUpdate();

Setting QT_QPA_UPDATE_IDLE_TIME=20 should prove that's the case.

Though I think this timer is a red herring. 

We're getting into this timer and rendering because the window is saying
"update me now!" and this is throttling it slightly. 
The bug we need to find is why the window is saying "update me now!" instead of
syncing to 60fps.

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