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Me and my friend have had this bug since release. When we play co-op together, battles go in slow motion, as in the units move painstakingly slow, even though the game is set to normal speed. Both our PCs can run the game easily, with no framerate issues and we have not encountered this in single player.
Our connection is also perfectly fine as we play many other games together with no problems whatsoever. Often this can also occur in the campaign map, with armies, agents, menus moving very slowly. I have seen other people have this problem but have not heard of a fix.