Here is a quick video example:
AOE4 Drag Pan Hang - Youtube
Details:
When pressing the button to drag pan, the games hangs momentarily. The hang can last anywhere from a few frames to up to a second or longer. In the linked video this can be seen when the villager animations freeze. Once the cursor goes away is when I can finally pan. This occurs in any mode (single player, multiplayer, spectating). Drag panning is currently bound to middle mouse button (Mouse 3) but it still happens with any other binding. Once I can actually start panning, it is smooth and doesn’t stutter or hang until I release the drag pan button and press it again. Edge panning or using arrow keys to pan does not trigger this hang.
Reproduction:
Unknown. I’m not sure what causes the hanging to start. It will be fine one day then start the next.
Work Around:
So far it seems like once it starts hanging, I have to restart my computer to make it stop but it will eventually start happening again and a restart will be needed again.