I just did vVH to try it out and luckily 'only' had one long freeze and zero disconnects this time. But I did end up stopping two runs about a week or so ago due to severe lag.
Trust me it’s not just Vateshran, any instanced PvE content has been near unplayable the past week. Constant lag spikes and disconnects. This was Dreadsail 2 nights ago, literally everyone in the group froze for 5+ seconds and 3 of them got disconnected afterwards.