Isssues with the campaign map

[Calypze]

Sometimes when I play EB, at the campaign map level, the mouse doesn't move smoothly, and not the units either. They move "laggingly". This is a little annoying. What can I do to fix it? Campaign map settings, as far as I know, are already at the lowest.

I've no problem with the battle map at all, and in RTW Vanilla and in another RTW mod, I don't have this problem with the campaign map.