[vitus]

bzip's compression ratio is hard to match without spending significantly more compute.

[GordonS]

Isn't bzip notoriously slow though?

[vitus]

Next to lz or zstd, sure, when you don't care about compression ratio.

But bzip2 -1 offers comparable compression to zstd -10, and bzip2 -9 is more like zstd -18 which is appreciably slower.

[aidenn0]

bzip2 decompression is slow. It's faster than xz for compression.