Soldato
They thought large gifs were slowing down and killing the page. Doesn't seem to be a matter of size, more broken gifs, or the inability of certain browsers to deal with some gif format properly.
Safari I am looking at you, and chrome could do with an upgrade to that side of things.
It might be an issue with the forum board software also, but I am unsure. Things certainly creak badly when trying to load the youtube threads on any browser.
It was basically mrk posting 80mb gifs which took ages to load, shame as in gifv (or webm) they would be fine but sadly the forum just dies with large gifs.