I love ajax, but with this plugin, I often get the top inch ov my backround image, and a loading gif for about 5-10 seconds. Somtimes it just hangs there till a refresh. I've got other ajax sites running with no issue, so it's not like I'm on a poor connection.
My site isn't particularly content intensive and I'm using the 2012 theme so afraid to say I've uninstalled it for the time being, hopefully to be reinstalled with a later version.
PS, can you customise the loader gif?