Currently, to get the first release date of a single recording, one has to search for its release group and parse the tag <first-release-date />. This causes a terrible slowdown when searching for multiple tracks (considering the limit of one lookup per second): for example, with a list of 10 tracks, instead of taking 10 seconds (1 per track), it takes 10 + N (where N is the number of release groups associated to all the tracks). N is usually a high number.
I'm asking if <first-release-date /> can be added to the <release-group /> tag in recording lookup. It would speed up a lot the new Amarok tagger I'm working on.