I think it looks great, and it doesn't take long to load for me.
I'm not super knowledgeable about CSS and HTML, but it would help if you included the raw code, so people could edit and test it.
I haven't gotten any new pet slots, but I'd been leaving a slot available. I recently (about a week or two ago.) got my hands on a Disco Chomby, now I have one in-game & in real life.