When it first starts, Songbird prompts the user to select default language and extensions it should load by default, downloading them if necessary. Scanning a music collection of almost 4000 OGG Vorbis songs took around 3 minutes on an Intel Core 2 Duo 1.8 GHz with 1 GB DDRAM2.
The best feature Songbird has is the integrated web browser from Mozilla, which allows tabs, the ability to enter any web address (for example you are not only limited to Wikipedia or Last.fm, you can search anywhere on the web for music), and it's completely configurable via the Tools -> Options menu. The same configuration window can be obtained by going at Edit -> Preferences. There is no point to have it in two places, but maybe it's a leftover from the Mozilla browser?