@baldur @alda All the cases I've seen over the years (a couple of folks have tested this) suggested that there is a small additional amount of savings, but it's small enough that it seems highly likely that minification is more often used as an obfuscation and/or "everybody does it" thing, and bandwidth savings are just a surface reason
(Especially considering that those same sites then often proceed to load megabytes of third-party junk and don't even bother optimizing their image compression)