QGraphicsItem.setPos takes a lot of time

[wysota]

There are many things you can do. For starters set the viewport update mode to FullViewportUpdate. If you're using OpenGL this should already be the case but then passing scene.update() with some parameters shouldn't make any difference. In general when moving all the items it is wise to disable indexing, enabling cache and doing some other things but it depends on a case-by-case basis.

[ricofe25]

Thank you. The FullViewportUpdate mode and indexing disabling have given valuable performance improvements.