Document rationale behind gzip

[gebn]

$ time xz -cT 0 newton.tar | wc -c
1453954588  // 1.35GiB

real    6m33.006s
user    13m0.724s
sys     0m1.608s
$ time gzip -c9 newton.tar | wc -c
1701486703  // 1.58GiB

real    1m16.832s
user    1m15.556s
sys     0m2.144s
$ time pigz -c9 newton.tar | wc -c
1702539244  // 1.59GiB

real    0m50.708s
user    1m39.512s
sys     0m1.488s
$ time pigz -c newton.tar | wc -c
1703702154  // 1.59GiB

real    0m44.796s
user    1m27.860s
sys     0m1.480s

pigz with default settings it is. There is enough bandwidth to S3 to upload at >1Gb/s - takes 15s to upload 1.9GiB. Not the bottleneck. Cost of storing 2G in S3 is <$.05/month