The issue on iPhone / iPad is a known issue. Apple "broke" toolbars (specifically fixed positioning) with mobile versions of their browser because the pinch-to-zoom concept didn't make sense with them. We are working on a better solution here since iPad / iPhone is becoming such a big market, and we want those people to have a premium experience too.
The load from a chat application like ours is mostly from detecting the presence of users. Our chat has to load / unload every time you transition between pages. This means we have to alert you of who is on the page as well as alert everyone else about your status. The actually chat messages are a pretty small part of the load, hence us structuring the pricing this way.
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