ah, i see... You could try the floatbox option "preloadAll" (see
http://randomous.com/floatbox/options ). this should stop preloading images (at least, it should only preload 1 image, if this is still to much, you have to contact the author of floatbox:
http://randomous.com/forum/forum.php?id=1 ). i'll include this option in the next update, for now you have to set this option manually (i.e. editing floatbox.js).