This comes even before installation.
This website offers two downloads of the WordPress code. One is in
zip format for all those Windows users, and one is
gzip, for those of us who want a reasonable compression ratio.
I grabbed the
gzip version, and it weighed 1,176,388 bytes.
advdef on it, and immediately knocked it down to 1,128,542. Come on WordPress: optimise your archives before putting them online!
Come to think of it, why use
gzip? I quickly ran
bzip2 on the tar archive, and got it down to 1,010,572. I tried
7za, and it got down to 888,774; with
lzma, I got it down to 879,175! That's three quarters of the size of the download.
I'm sure that anyone who has
gzip on their machine has (at the very least)
bzip2 too. So use it!
And if bandwidth doesn't matter, why are you compressing stuff?
OK, that's my nerdy rant over.