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

file insize instate stats outsize outstate savings
blue.png 2378 bytes /c2 /f5 /n1
Kernel  Time =     0.015 =   11%
User    Time =     0.468 =  347%
Process Time =     0.484 =  358%    Virtual  Memory =     59 MB
Global  Time =     0.135 =  100%    Physical Memory =     34 MB
2378 bytes - -
gray.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.343 =  349%
Process Time =     0.343 =  349%    Virtual  Memory =     58 MB
Global  Time =     0.098 =  100%    Physical Memory =     30 MB
2377 bytes /c3 /f1 /d8 /n2 5205 bytes
green.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.046 =   44%
User    Time =     0.312 =  299%
Process Time =     0.359 =  344%    Virtual  Memory =     58 MB
Global  Time =     0.104 =  100%    Physical Memory =     30 MB
2377 bytes /c3 /f1 /d8 /n2 5205 bytes
multi.png 629573 bytes /c2 /f0 /n257
Kernel  Time =     0.015 =    3%
User    Time =     1.562 =  397%
Process Time =     1.578 =  401%    Virtual  Memory =     80 MB
Global  Time =     0.393 =  100%    Physical Memory =     50 MB
5671 bytes /c2 /f4 /n11 623902 bytes
multi-alpha.png 796228 bytes /c6 /f0 /n257
Kernel  Time =     0.656 =   37%
User    Time =     5.031 =  287%
Process Time =     5.687 =  325%    Virtual  Memory =     95 MB
Global  Time =     1.747 =  100%    Physical Memory =     65 MB
52337 bytes /c6 /f2 /n19 743891 bytes
multi-avg.png 96663 bytes /c2 /f4 /n257
Kernel  Time =     0.000 =    0%
User    Time =     2.109 =  364%
Process Time =     2.109 =  364%    Virtual  Memory =     76 MB
Global  Time =     0.577 =  100%    Physical Memory =     48 MB
14008 bytes /c2 /f3 /n12 82655 bytes
multi-cq.png 92377 bytes /c2 /f4 /n3
Kernel  Time =     0.062 =    4%
User    Time =     4.515 =  342%
Process Time =     4.578 =  347%    Virtual  Memory =     76 MB
Global  Time =     1.318 =  100%    Physical Memory =     60 MB
60980 bytes /c2 /f1 /n11 31397 bytes
purple.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.031 =   24%
User    Time =     0.421 =  325%
Process Time =     0.453 =  349%    Virtual  Memory =     72 MB
Global  Time =     0.129 =  100%    Physical Memory =     36 MB
2377 bytes /c3 /f1 /d8 /n2 1573622 bytes
purple-noise.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.000 =    0%
User    Time =     4.515 =  444%
Process Time =     4.515 =  444%    Virtual  Memory =     81 MB
Global  Time =     1.016 =  100%    Physical Memory =     70 MB
320643 bytes /c2 /f3 /n8 1255356 bytes
red-alpha.png 3306 bytes /c6 /f4 /n1
Kernel  Time =     0.015 =   10%
User    Time =     0.437 =  304%
Process Time =     0.453 =  315%    Virtual  Memory =     59 MB
Global  Time =     0.143 =  100%    Physical Memory =     31 MB
2644 bytes /c3 /f1 /d8 /n2 662 bytes
total savings 4321895 bytes
total time 5,66 seconds