Hi Mingye, > [Zstd and brotli each have a "dictionary mode" to deal with this, but > (a) Zstd dict-file requires an extra flag on decompress (b) nobody has > brotli, which has a default dictionary, installed.] I found brotli was already installed here. So here's some numbers, just for the lists' info. $ ls | grep '\.gz$' | shuf -n10 | > while read -r f; do > printf '%32s %5d %5d\n' "$f" `wc -c <"$f"` \ > `zcat "$f" | brotli | wc -c` > done | > awk '{print $0 " " $3/$2}' postmap.1.gz 4125 3333 0.808 gnutls-cli-debug.1.gz 2627 2108 0.802436 cwebp.1.gz 5074 4106 0.809223 findsmb.1.gz 1810 1474 0.814365 ppmntsc.1.gz 1282 973 0.75897 libuv.1.gz 76363 62274 0.8155 xmlwf.1.gz 3486 2760 0.791738 users.1.gz 763 572 0.749672 gpgparsemail.1.gz 294 231 0.785714 perl561delta.1perl.gz 51764 42957 0.829862 $ -- Cheers, Ralph.