Yep, it should be going through UglifyJS already. It turns out the 1,049.65 kB figure is actually uncompressed, gzipped it comes to 274K which isn't that bad but there is definitely room for improvement. I think the biggest wins here would come from removing our dependency on giant libraries like jQuery UI which are being included right now but are used pretty sparingly.
There are installation instructions here: https://github.com/hummingbird-me/hummingbird/blob/master/docs/INSTALL-DEVELOPMENT.md
Still need to create a development database dump though, will probably have that ready this weekend. I haven't linked to it in the README yet because I'm planning to move it to the Github wiki.