e.g. https://beta.musicbrainz.org/release/8cfebf54-4fdd-49ba-b578-06fe8c343eaf which as 18 + 18 + 194 + 1 tracks (so it's not even one of those gigantic box sets) takes over a minute to render for me in Opera 12.14 in OSX and confirmed by bitmap in 12.16 in OSX. As it's loading, you can see tracks being added to the bottom of the table and it hogs the CPU.