Just had the same issue in dual gap game (6v6, no AI).Very long game, much units, happened at the moment I unzoomed very quickly. Farthest regions on the map didn't load unit icons.
yes there is (maybe) an error inside the ProcessBuildCommand function that causes the function to loop
every 10 milliseconds and this is lagging the game out.
I will do some test and release an update tomorrow.
Try it without any mods enabled and see if that helps, then slowly add back in mods until it stops working again and let us know which mod breaks it. Also it can be a bit buggy where it takes half a second or so to show up especially if you have draggable build queues enabled which I'd highly recommend turning off. Make sure you're doing it either with only one factory selected or if you have multiple factories selected that they're all on the same repeat setting before using the hotkey as well.
