Dragging tickets from column to column on the Active board can be quite a frustrating process.
It takes a while (up to several seconds) for the landing column to appear once a ticket has been partially dragged with the mouse.
Scrolling up and down on a board is also quite frustrating as it will scroll a bit then wait for tickets to load in (again taking up to a second) then scrolling a bit more and waiting.
Now take both of these issues together and try re-ordering a ticket within a column. Ouch.