When I now tested the Beta I've got extreme loading times. Both when loading the game and within the game (i.e. fast movement). This was not the case before the Beta. This unfortunate make the game unplayable, so I must opt out this Beta.
I hope that when the real patch is coming out, that this is not going to be an issue.
Edit: I should mention that I am not using any mods or anything else for that matter - just the plain game as is.