oxipng — oxipng.exe -o 6 --libdeflater --alpha --strip all

file insize instate stats outsize outstate savings
air.png 1524850 bytes /c2 /f4 /n10
Kernel  Time =     0.046 =    3%
User    Time =     5.453 =  452%
Process Time =     5.500 =  456%    Virtual  Memory =     88 MB
Global  Time =     1.204 =  100%    Physical Memory =     83 MB
1330926 bytes /c2 /f5 /n158 193924 bytes
bridge.png 1762214 bytes /c2 /f4 /n9
Kernel  Time =     0.093 =    7%
User    Time =     5.359 =  415%
Process Time =     5.453 =  422%    Virtual  Memory =     92 MB
Global  Time =     1.291 =  100%    Physical Memory =     54 MB
1512731 bytes /c2 /f3 /n178 249483 bytes
citroen.png 1936514 bytes /c2 /f4 /n14
Kernel  Time =     0.046 =    6%
User    Time =     2.750 =  384%
Process Time =     2.796 =  391%    Virtual  Memory =     92 MB
Global  Time =     0.714 =  100%    Physical Memory =     66 MB
1798470 bytes /c2 /f5 /n46 138044 bytes
correfocs.png 1936225 bytes /c2 /f4 /n12
Kernel  Time =     0.078 =    6%
User    Time =     4.765 =  390%
Process Time =     4.843 =  397%    Virtual  Memory =     95 MB
Global  Time =     1.219 =  100%    Physical Memory =     74 MB
1681300 bytes /c2 /f3 /n80 254925 bytes
dune.png 2251285 bytes /c2 /f4 /n9
Kernel  Time =     0.031 =    3%
User    Time =     3.125 =  380%
Process Time =     3.156 =  384%    Virtual  Memory =     98 MB
Global  Time =     0.820 =  100%    Physical Memory =     77 MB
2010239 bytes /c2 /f5 /n20 241046 bytes
eaglefairy.png 2167502 bytes /c2 /f4 /n5
Kernel  Time =     0.031 =    3%
User    Time =     3.625 =  387%
Process Time =     3.656 =  391%    Virtual  Memory =     98 MB
Global  Time =     0.934 =  100%    Physical Memory =     63 MB
1880015 bytes /c2 /f5 /n166 287487 bytes
irargerich.png 2066635 bytes /c2 /f4 /n15
Kernel  Time =     0.078 =    6%
User    Time =     4.656 =  404%
Process Time =     4.734 =  411%    Virtual  Memory =     97 MB
Global  Time =     1.150 =  100%    Physical Memory =     86 MB
1842747 bytes /c2 /f5 /n100 223888 bytes
kavica.png 1863164 bytes /c2 /f4 /n8
Kernel  Time =     0.015 =    2%
User    Time =     2.437 =  370%
Process Time =     2.453 =  372%    Virtual  Memory =     90 MB
Global  Time =     0.658 =  100%    Physical Memory =     58 MB
1720006 bytes /c2 /f3 /n125 143158 bytes
mercado.png 2257065 bytes /c2 /f4 /n9
Kernel  Time =     0.046 =    6%
User    Time =     2.640 =  381%
Process Time =     2.687 =  388%    Virtual  Memory =     95 MB
Global  Time =     0.691 =  100%    Physical Memory =     68 MB
2120754 bytes /c2 /f5 /n26 136311 bytes
panthera.png 1795149 bytes /c2 /f4 /n14
Kernel  Time =     0.046 =    3%
User    Time =     5.515 =  441%
Process Time =     5.562 =  445%    Virtual  Memory =     93 MB
Global  Time =     1.248 =  100%    Physical Memory =     83 MB
1552109 bytes /c2 /f3 /n166 243040 bytes
park.png 1925839 bytes /c2 /f4 /n11
Kernel  Time =     0.046 =    6%
User    Time =     2.859 =  400%
Process Time =     2.906 =  406%    Virtual  Memory =     90 MB
Global  Time =     0.714 =  100%    Physical Memory =     73 MB
1816269 bytes /c2 /f3 /n47 109570 bytes
source.png 2123295 bytes /c2 /f4 /n14
Kernel  Time =     0.062 =    9%
User    Time =     2.375 =  364%
Process Time =     2.437 =  374%    Virtual  Memory =     93 MB
Global  Time =     0.651 =  100%    Physical Memory =     68 MB
2005677 bytes /c2 /f5 /n32 117618 bytes
swallowtail.png 2041337 bytes /c2 /f4 /n10
Kernel  Time =     0.015 =    1%
User    Time =     4.312 =  398%
Process Time =     4.328 =  400%    Virtual  Memory =     97 MB
Global  Time =     1.081 =  100%    Physical Memory =     77 MB
1809812 bytes /c2 /f3 /n149 231525 bytes
tivoli.png 2240511 bytes /c2 /f4 /n8
Kernel  Time =     0.031 =    3%
User    Time =     3.031 =  380%
Process Time =     3.062 =  384%    Virtual  Memory =     96 MB
Global  Time =     0.796 =  100%    Physical Memory =     68 MB
2112022 bytes /c2 /f5 /n59 128489 bytes
total savings 2698508 bytes
total time 13,17 seconds