oxipng — oxipng.exe -o 6 --libdeflater --threads 1 --alpha --strip all

file insize instate stats outsize outstate savings
air.png 1524850 bytes /c2 /f4 /n10
Kernel  Time =     0.046 =    1%
User    Time =     3.859 =   98%
Process Time =     3.906 =  100%    Virtual  Memory =     38 MB
Global  Time =     3.905 =  100%    Physical Memory =     42 MB
1330926 bytes /c2 /f5 /n158 193924 bytes
bridge.png 1762214 bytes /c2 /f4 /n9
Kernel  Time =     0.046 =    1%
User    Time =     3.796 =   98%
Process Time =     3.843 =   99%    Virtual  Memory =     43 MB
Global  Time =     3.846 =  100%    Physical Memory =     40 MB
1512731 bytes /c2 /f3 /n178 249483 bytes
citroen.png 1936514 bytes /c2 /f4 /n14
Kernel  Time =     0.015 =    0%
User    Time =     2.015 =   99%
Process Time =     2.031 =   99%    Virtual  Memory =     41 MB
Global  Time =     2.033 =  100%    Physical Memory =     41 MB
1798470 bytes /c2 /f5 /n46 138044 bytes
correfocs.png 1936225 bytes /c2 /f4 /n12
Kernel  Time =     0.078 =    2%
User    Time =     3.234 =   96%
Process Time =     3.312 =   98%    Virtual  Memory =     45 MB
Global  Time =     3.352 =  100%    Physical Memory =     46 MB
1681300 bytes /c2 /f3 /n80 254925 bytes
dune.png 2251285 bytes /c2 /f4 /n9
Kernel  Time =     0.015 =    0%
User    Time =     2.125 =   98%
Process Time =     2.140 =   98%    Virtual  Memory =     46 MB
Global  Time =     2.165 =  100%    Physical Memory =     46 MB
2010239 bytes /c2 /f5 /n20 241046 bytes
eaglefairy.png 2167502 bytes /c2 /f4 /n5
Kernel  Time =     0.062 =    2%
User    Time =     2.500 =   97%
Process Time =     2.562 =   99%    Virtual  Memory =     46 MB
Global  Time =     2.564 =  100%    Physical Memory =     45 MB
1880015 bytes /c2 /f5 /n166 287487 bytes
irargerich.png 2066635 bytes /c2 /f4 /n15
Kernel  Time =     0.031 =    0%
User    Time =     3.250 =   98%
Process Time =     3.281 =   99%    Virtual  Memory =     45 MB
Global  Time =     3.309 =  100%    Physical Memory =     47 MB
1842747 bytes /c2 /f5 /n100 223888 bytes
kavica.png 1863164 bytes /c2 /f4 /n8
Kernel  Time =     0.015 =    0%
User    Time =     1.718 =   98%
Process Time =     1.734 =   99%    Virtual  Memory =     41 MB
Global  Time =     1.744 =  100%    Physical Memory =     41 MB
1720006 bytes /c2 /f3 /n125 143158 bytes
mercado.png 2257065 bytes /c2 /f4 /n9
Kernel  Time =     0.031 =    1%
User    Time =     1.812 =   96%
Process Time =     1.843 =   98%    Virtual  Memory =     43 MB
Global  Time =     1.874 =  100%    Physical Memory =     43 MB
2120754 bytes /c2 /f5 /n26 136311 bytes
panthera.png 1795149 bytes /c2 /f4 /n14
Kernel  Time =     0.171 =    4%
User    Time =     3.937 =   96%
Process Time =     4.109 =  100%    Virtual  Memory =     44 MB
Global  Time =     4.091 =  100%    Physical Memory =     46 MB
1552109 bytes /c2 /f3 /n166 243040 bytes
park.png 1925839 bytes /c2 /f4 /n11
Kernel  Time =     0.031 =    1%
User    Time =     2.062 =   98%
Process Time =     2.093 =   99%    Virtual  Memory =     41 MB
Global  Time =     2.098 =  100%    Physical Memory =     43 MB
1816269 bytes /c2 /f3 /n47 109570 bytes
source.png 2123295 bytes /c2 /f4 /n14
Kernel  Time =     0.031 =    1%
User    Time =     1.734 =   97%
Process Time =     1.765 =   99%    Virtual  Memory =     41 MB
Global  Time =     1.772 =  100%    Physical Memory =     41 MB
2005677 bytes /c2 /f5 /n32 117618 bytes
swallowtail.png 2041337 bytes /c2 /f4 /n10
Kernel  Time =     0.046 =    1%
User    Time =     3.062 =   98%
Process Time =     3.109 =  100%    Virtual  Memory =     47 MB
Global  Time =     3.106 =  100%    Physical Memory =     48 MB
1809812 bytes /c2 /f3 /n149 231525 bytes
tivoli.png 2240511 bytes /c2 /f4 /n8
Kernel  Time =     0.031 =    1%
User    Time =     2.140 =   98%
Process Time =     2.171 =  100%    Virtual  Memory =     44 MB
Global  Time =     2.169 =  100%    Physical Memory =     44 MB
2112022 bytes /c2 /f5 /n59 128489 bytes
total savings 2698508 bytes
total time 38,03 seconds