A lot of things on websites these days take their toll. Facebook js files (like boxes etc), google ads and google maps are really heavy. It also happened on my

A lot of things on websites these days take their toll. Facebook js files (like boxes etc), google ads and google maps are really heavy. It also happened on my own sites to have issues with facebook components loading very slowly. I mean if you consider that just to have a facebook like box it involves loading a JS file, that then scans the page for FBML and then replaces it with an iframe (which also causes the page to repaint because its size is set after the dom is ready) and then the iframe requests 10+ additional files from facebook you understand why some pages take so long to render.