gistfile1.txt

~/ $ time -l guetzli IMG_8933.JPG IMG_8933.guetzli.JPG
      941.51 real       901.37 user        33.45 sys
3057623040  maximum resident set size
         0  average shared memory size
         0  average unshared data size
         0  average unshared stack size
   8523458  page reclaims
         0  page faults
         0  swaps
       127  block input operations
        10  block output operations
         0  messages sent
         0  messages received
         0  signals received
       128  voluntary context switches
    822943  involuntary context switches

~/ $ identify IMG_8933.JPG
IMG_8933.JPG JPEG 4032x3024 4032x3024+0+0 8-bit sRGB 3.859MB 0.000u 0:00.009

~/ $ identify IMG_8933.guetzli.JPG
IMG_8933.guetzli.JPG JPEG 4032x3024 4032x3024+0+0 8-bit sRGB 3.224MB 0.000u 0:00.009