JPEG recompression 2022-01-31
    web content (mostly)
        (optimized)

JXL = cjxl -e 9 -E 3 -I 1
BRN = cbrunsli
PJG = packJPG -ver
LEP = lepton-slow-best-ratio

Wins are smallest results.

           savings %
         median  mean   wins
JXL       12.92  15.73   311
BRN       15.58  16.72   408
BRN/JXL   15.76  17.30   719
PJG       16.83  17.43  1223
LEP       16.95  17.63  1743
PJG/JXL   17.00  18.04  1534
LEP/JXL   17.08  18.23  2054
LEP/BRN   17.14  17.89  2151
PJG/BRN   17.17  17.72  1631
PJG/LEP   17.17  17.77  2965
any       17.42  18.38  3684