I ran Firebug on the page (your live one) and saw but one small css issue that should not have created the slowdown you are experiencing.
www.dinkyfingerprint.co.uk/
Expected end of value but found 'font-weight'. Error in parsing value for 'letter-spacing'. Declaration dropped.
letter-spacing: 0px font-weight: normal;
template.css (line 61, col 34)
Maybe someone else will be able to determine the reason for the slowdown.