How to improve performance of widget containing multiple labels with pictures

[MidWay]

So i have a widget that contains large number of labels that display images. All is well until i start scrolling the label, the widget containing the labels is wider than the visible window. When scrolling for the first time i get some sort of microstutters / performance issues evry time a new row of labels appears on window. Performance issues are fixed after i have scrolled to the end once. Is there maybe a way to predraw the labels or something that would make the first time scrolling smoother?

[wysota]

Please provide a minimal compilable example reproducing the problem.