From a thread I posted yesterday:

"I attempted two dungeons this morning, but I had some very huge problems in them. These all happened over different attempts:

In total, 3 people's character models just stopped in place and wouldn't move, but looking at the map I could see each of their blue circles where the action was, fighting enemies. In addition to this they were taking damage and if I ran over to their models I could see them performing attacking actions, even though from my point of view the models were just standing still very far away from the action while attacking the air. I could target their character models only, but if I tried performing an action on them it simply told me they were out of range.

In total, 2 people's models simply disappeared. I couldn't see them at all but I could see the attacking animations (like the archer's arrows) and they were receiving damage. If I looked on the mini-map they weren't on it, but if I looked on the actual map I could see their blue dots.

On top of this, every few minutes the dungeon would simply freeze for about 5 seconds. All character models stayed still for this long except for mine and any actions I performed seemed to all stack and occur at once when it fixed.
These are very huge problems, but it's made even worse if I tell you that I was meant to be the healer. Note that other than the 3rd one which I've had a lot since the 28th of August, none of these problems have occurred outside of dungeons before. At least not with party members.

Thanks."

Quite simply put, dungeons are unplayable for me at the moment. I have done another dungeon since then and the lag just made in unplayable if I didn't have my friend there telling me who to heal. Apparently I could heal people while it was frozen, but I wasn't receiving information telling me how damaged they were or what was attacking me so I needed my friend to tell me who to heal. Sometimes it would only last for about 3 seconds, but it's lasted as long as 20 seconds before and it's occurred as frequently as once per minute. I don't know how long I will be able to deal with this... The lag has been getting worse every day...