Posted on: 08/18/11 10:37PM
As far as I can tell, there are no Java applets whatsoever being run by the site (my main evidence is that my computer isn't screaming at me even though I've got close to a dozen Gelbooru tabs open), so it's probably server-side.
EDIT: holy shit I responded to something on the first page. I need to pay more attention still. It was still more productive than An0n's comment before mine though.