One thing:
AJAX does not mean "I am a client-server application that is fully synchronized all the time with the database"
It does mean "click a button, and not the entire page gets renewed, but only one part of it, using an XML request -> response from the server, then the browser tweaks in the changed info".
That's it. You do not get a whoopy client-server active lotgd. That's not doable. Try to make WoW with a browser only, you'll fail.
Ok, well. The mail has a 15 sec autorefresh (which puts load on the system) but it defaults to OFF in the prefs (some users have troubles with their security software + auto-refreshes). I tested it with FF, IE, Safari, no issues. (a badnav page won't refresh, though...)
Currently there is "AJAX off" setting, but if necessary I will apply it.
There is only one issue currently preventing me from releasing 1.1.1.1 +nb (new version for updaters) which is the tempstat thingy not really working. It was surely an issue before me, so it's hard to dig it out, most servers won't use tempstats.