I haven’t tried what you are attempting, but I would recommend to put the scrollbars inside the QtQuick code by using a ScrollView from QtQuick.Controls.
This would save quite a bit of resources since the framebuffer of the QQuickView will be limited to what is shown on screen.
You can have arbitrarily large ScrollView this way, but with your approach you will be limited by the maximum size of an OpenGL window.
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