QGraphicsScene/QGraphicsView performance?

Most likely your graphics item has mistakes in the implementation. I had similar behavior, but I was unable to figure out what exactly causes it. I suspect that this happens when you draw outside of the bounding rect.

This triggers some clean up routine, which in turn causes redraw of the item, and here goes the loop. Eventually I resolved the issue by carefully inspecting the implementation of my custom graphics item and making sure that.

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