I commented in the official thread already, but will add this here:
Vox is a small population server. It won't take that many transfers of AB Euro time players for them to form a significant if not majority of the population. Apparently, AB runs mostly out of a server pack in Belgium with some rumoured aspects tied to the USA servers.
Going Vox eliminates this variable and therefore hopefully the lag issues AB has been suffering with for 8+ months (which begs the question "What did you change 8+ months ago, since there wasn't a massive spike up in population?")