Remember, what you see on your screen and what the other person sees is completely different. I have never seen a hunter running with a pet lagging way behind. Even at the worst possible times when mine was ready to despawn, all the other hunters were running hand in paw with their pets. In fact, most pets ran in front of them. That is because the information is being sent to us 'after' it has happened with the hunter. We see what the server is saying is 'supposed' to be happening. Since the lag and despawn was never 'supposed' to happen, the server sending information to us didn't take it into account and we see what should be happening.
On the same note, it seems the pathing and run speed problems have been fixed much better. Also, I have tried jumping off places where there is no pathing, and although there might be a bit of hesitancy, as I turn around, I see my pet "jumping" right behind me. He no longer looks for the 'safe' route down. So perhaps the *****-ups with the pet pulling the whole place to us has been resolved. Others should check this out however. I was in Needles and jumping off the bridges and paths around the monoliths. (Is it mono-lith if there are more than one?) :)
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Kraen - 37 Hunter Pve
ICThruU - 11 Warlock PvE
Krayn - 14 Rogue PvE
Krayn - 60 Rogue PvP Gurubashi
Kraynspots - 29 Druid Gurubashi
Lupol - 29 Hunter Gurubashi