I have an app where multiple nodes not fitting withing the screen are animated. The pulse logger shows that the number of rendered nodes on every pulse is either the number of nodes actually showing in the screen or all nodes. That apparently causes instability in the reported fps.
What actually happens is that when BaseNode.accumulateNodeDirtyRegion() returns DTR_OK the dirty region container (AbstractPainter.dirtyRegionContainer) contains one element and only those nodes that intersect with that element are rendered. But when BaseNode.accumulateNodeDirtyRegion() returns DTR_CONTAINS_CLIP the dirty region container is empty and no culling is done in AbstractPainter.paintImpl() leading to rendering all nodes even those not intersecting with the clip (not visible).
When I try a simple fix of adding the clip to the container (attached patch), only visible nodes are rendered on every frame and performance becomes stable.