http://www.livejournal.com/support/faqbrowse.bml?faqid=40
For problems with large images on the Friends page, users could also enable image placeholders temporarily. But I'm not sure how strongly we want to suggest that because we'd also have to explain the quirks of the placeholding option, like how it'll hide a small image too if the small image doesn't have width/height attributes.
Already proposed recently, as pointed out by
rho :)