Still, in my experience, Facebook chats loads several Megabytes (that's gzipped size) of JavaScript upon startup. In this case, lazy loading gets into the way o

Still, in my experience, Facebook chats loads several Megabytes (that's gzipped size) of JavaScript upon startup. In this case, lazy loading gets into the way of performance, as Facebook chat ends up lazily loading 102 files (if I recall correctly).