My tip for you, DarkMario2, is to disable (not uninstall, just disable) EVERYTHING you wont be using for your comic from the Workshop of whatever.
Also, use the remover tool to remove any potential over-loading or big things in the map you dont need, like broken vehicles, capture-points, billboards, etc. Anything that wont matter in the comic.
(Im having the same problem with my comic, but i removed some unnecessary stuff that wouldn't be seen anyways or doesn't matter, and it went a bit smooth)