well, consider, there's translations, cleaning up, getting the chapters, redrawing, etc., posting a new chapter is not an easy process. It usually takes an entire team. And if i'm correct, VF isn't a weekly or monthly updated, so the chapters in general take longer to come out. it just takes a while.
They have caught up to the magazine publications and can only post what has been drawn and published. Getting a chapter every couple of months is pretty good.
They are taking firever just to post a new chapter ( ̄へ ̄)