oxipng — oxipng.exe -o 2 --libdeflater --threads 1 --alpha --strip all

file insize instate stats outsize outstate savings
air.png 1524850 bytes /c2 /f4 /n10
Kernel  Time =     0.046 =    3%
User    Time =     1.390 =   95%
Process Time =     1.437 =   98%    Virtual  Memory =     26 MB
Global  Time =     1.454 =  100%    Physical Memory =     29 MB
1330926 bytes /c2 /f5 /n158 193924 bytes
bridge.png 1762214 bytes /c2 /f4 /n9
Kernel  Time =     0.015 =    1%
User    Time =     1.375 =   98%
Process Time =     1.390 =   99%    Virtual  Memory =     28 MB
Global  Time =     1.392 =  100%    Physical Memory =     25 MB
1522202 bytes /c2 /f5 /n184 240012 bytes
citroen.png 1936514 bytes /c2 /f4 /n14
Kernel  Time =     0.046 =    5%
User    Time =     0.828 =   93%
Process Time =     0.875 =   99%    Virtual  Memory =     28 MB
Global  Time =     0.883 =  100%    Physical Memory =     28 MB
1798470 bytes /c2 /f5 /n46 138044 bytes
correfocs.png 1936225 bytes /c2 /f4 /n12
Kernel  Time =     0.015 =    1%
User    Time =     1.234 =   98%
Process Time =     1.250 =   99%    Virtual  Memory =     29 MB
Global  Time =     1.253 =  100%    Physical Memory =     29 MB
1684914 bytes /c2 /f5 /n77 251311 bytes
dune.png 2251285 bytes /c2 /f4 /n9
Kernel  Time =     0.078 =    8%
User    Time =     0.875 =   91%
Process Time =     0.953 =   99%    Virtual  Memory =     31 MB
Global  Time =     0.957 =  100%    Physical Memory =     31 MB
2010239 bytes /c2 /f5 /n20 241046 bytes
eaglefairy.png 2167502 bytes /c2 /f4 /n5
Kernel  Time =     0.062 =    5%
User    Time =     1.031 =   94%
Process Time =     1.093 =   99%    Virtual  Memory =     31 MB
Global  Time =     1.096 =  100%    Physical Memory =     29 MB
1880015 bytes /c2 /f5 /n166 287487 bytes
irargerich.png 2066635 bytes /c2 /f4 /n15
Kernel  Time =     0.031 =    2%
User    Time =     1.234 =   96%
Process Time =     1.265 =   99%    Virtual  Memory =     30 MB
Global  Time =     1.273 =  100%    Physical Memory =     32 MB
1842747 bytes /c2 /f5 /n100 223888 bytes
kavica.png 1863164 bytes /c2 /f4 /n8
Kernel  Time =     0.015 =    2%
User    Time =     0.734 =   97%
Process Time =     0.750 =   99%    Virtual  Memory =     27 MB
Global  Time =     0.751 =  100%    Physical Memory =     25 MB
1725371 bytes /c2 /f5 /n83 137793 bytes
mercado.png 2257065 bytes /c2 /f4 /n9
Kernel  Time =     0.031 =    3%
User    Time =     0.765 =   94%
Process Time =     0.796 =   98%    Virtual  Memory =     29 MB
Global  Time =     0.812 =  100%    Physical Memory =     29 MB
2120754 bytes /c2 /f5 /n26 136311 bytes
panthera.png 1795149 bytes /c2 /f4 /n14
Kernel  Time =     0.046 =    3%
User    Time =     1.390 =   96%
Process Time =     1.437 =   99%    Virtual  Memory =     28 MB
Global  Time =     1.444 =  100%    Physical Memory =     31 MB
1563348 bytes /c2 /f5 /n160 231801 bytes
park.png 1925839 bytes /c2 /f4 /n11
Kernel  Time =     0.031 =    3%
User    Time =     0.828 =   95%
Process Time =     0.859 =   99%    Virtual  Memory =     27 MB
Global  Time =     0.867 =  100%    Physical Memory =     30 MB
1824104 bytes /c2 /f5 /n42 101735 bytes
source.png 2123295 bytes /c2 /f4 /n14
Kernel  Time =     0.062 =    7%
User    Time =     0.718 =   91%
Process Time =     0.781 =   99%    Virtual  Memory =     28 MB
Global  Time =     0.786 =  100%    Physical Memory =     28 MB
2005677 bytes /c2 /f5 /n32 117618 bytes
swallowtail.png 2041337 bytes /c2 /f4 /n10
Kernel  Time =     0.015 =    1%
User    Time =     1.140 =   98%
Process Time =     1.156 =  100%    Virtual  Memory =     30 MB
Global  Time =     1.154 =  100%    Physical Memory =     31 MB
1831224 bytes /c2 /f5 /n135 210113 bytes
tivoli.png 2240511 bytes /c2 /f4 /n8
Kernel  Time =     0.031 =    3%
User    Time =     0.859 =   95%
Process Time =     0.890 =   99%    Virtual  Memory =     30 MB
Global  Time =     0.899 =  100%    Physical Memory =     29 MB
2112022 bytes /c2 /f5 /n59 128489 bytes
total savings 2639572 bytes
total time 15,02 seconds