Its bugs. Im sure it'll get better. For example, initiative is broken still. Keeps skipping characters and then jumping back to ones that were skipped.
I bet the issue is that they are trying to make it so enemies are smart so that the game is more challenging. In the old games, like Pool of Radiance, they naturally went faster because all they did was go after the closest character.
In BG3, they seem to analyze your actions more. It's broken, so it doesn't really work, but they do think. Well, at least, seems that way to me.
I bet when they're finished it'll be awesome.