This has plagued me for ages; I was hoping 2018r1 might fix it, but no joy. When I perform horizontal scrolling on a ListBox, the heading row moves instantaneously with the scrollbar, but the rest of the rows in the ListBox lag behind by ?250ms, and it looks very unprofessional. As soon as scrolling stops, the data area catches up with the heading row and everything looks good again. I don’t know if this is a Windows “flicker” issue, or something different. It works perfectly under MacOS.