[lj3]

From the article:

Lepton can decompress significantly faster than line-speed for typical consumer and business connections. Lepton is a fully streamable format, meaning the decompression can be applied to any file as that file is being transferred over the network. Hence, streaming overlaps the computational work of the decompression with the file transfer itself, hiding latency from the user.

In my humble opinion, dropbox's image gallery webapp is considerably faster than any other I've seen, especially when compared to imgur.