OK thanks
There does not seem to be any change - there is still about a 2-3 second lag before the icons load. And they don't all load at once, they do so one at a time if that helps
It's better in IE 9 - just over one second to load, and faster still in IE 9 64 bit. So it may be a Chrome issue or setting?
In the meantime I have turned them off and page loads are instant again