With this release I've moved from the go-lastfm library over to gobble-fm which amongst other improvements allows for really easy bulk scrobble submissions.
This delivers a massive performance improvement (and is a little bit nicer to last.fm's servers) since we're now sending up to 50 scrobbles per HTTP request as opposed to a single scrobble. Just look at the gif in the readme and compare it to the previous one in the pix/ folder!