Noticed it too. The more "allied" creatures you have, the harder you lag. Was happening to me too with the rag doll bag. It seems that owner's PC plays the role of AI for those creatures, so it's a heavy load for connection and a bit more load for CPU.
As for my last post, don't get me wrong, I don't have anything against a bit of fun like that. I didn't mind at all, even found funny seeing Kiwis running around Tir Chonail, but elephant standing right in front of Dun's bank, or red golem at the moon gate were a bit too much.
Not mentioning that Ch1 Dun Square is laggy enough even without all the additional models and textures.