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

file insize instate stats outsize outstate savings
blue.png 2378 bytes /c2 /f5 /n1
Kernel  Time =     0.031 =    9%
User    Time =     0.312 =   93%
Process Time =     0.343 =  102%    Virtual  Memory =     15 MB
Global  Time =     0.335 =  100%    Physical Memory =     14 MB
2378 bytes - -
gray.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.015 =    5%
User    Time =     0.265 =   94%
Process Time =     0.281 =   99%    Virtual  Memory =     15 MB
Global  Time =     0.281 =  100%    Physical Memory =     13 MB
2377 bytes /c3 /f1 /d8 /n2 5205 bytes
green.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.281 =   99%
Process Time =     0.281 =   99%    Virtual  Memory =     15 MB
Global  Time =     0.281 =  100%    Physical Memory =     13 MB
2377 bytes /c3 /f1 /d8 /n2 5205 bytes
multi.png 629573 bytes /c2 /f0 /n257
Kernel  Time =     0.000 =    0%
User    Time =     1.093 =  100%
Process Time =     1.093 =  100%    Virtual  Memory =     34 MB
Global  Time =     1.086 =  100%    Physical Memory =     33 MB
5672 bytes /c2 /f5 /n11 623901 bytes
multi-alpha.png 796228 bytes /c6 /f0 /n257
Kernel  Time =     0.453 =   10%
User    Time =     3.703 =   88%
Process Time =     4.156 =   99%    Virtual  Memory =     47 MB
Global  Time =     4.162 =  100%    Physical Memory =     45 MB
52337 bytes /c6 /f2 /n19 743891 bytes
multi-avg.png 96663 bytes /c2 /f4 /n257
Kernel  Time =     0.015 =    1%
User    Time =     1.531 =   98%
Process Time =     1.546 =   99%    Virtual  Memory =     32 MB
Global  Time =     1.557 =  100%    Physical Memory =     30 MB
14008 bytes /c2 /f3 /n12 82655 bytes
multi-cq.png 92377 bytes /c2 /f4 /n3
Kernel  Time =     0.015 =    0%
User    Time =     3.562 =   99%
Process Time =     3.578 =   99%    Virtual  Memory =     32 MB
Global  Time =     3.585 =  100%    Physical Memory =     33 MB
60980 bytes /c2 /f1 /n11 31397 bytes
purple.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.015 =    5%
User    Time =     0.312 =  104%
Process Time =     0.328 =  109%    Virtual  Memory =     21 MB
Global  Time =     0.299 =  100%    Physical Memory =     18 MB
2377 bytes /c3 /f1 /d8 /n2 1573622 bytes
purple-noise.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.031 =    0%
User    Time =     3.484 =   98%
Process Time =     3.515 =   99%    Virtual  Memory =     30 MB
Global  Time =     3.526 =  100%    Physical Memory =     31 MB
320643 bytes /c2 /f3 /n8 1255356 bytes
red-alpha.png 3306 bytes /c6 /f4 /n1
Kernel  Time =     0.031 =    9%
User    Time =     0.328 =  100%
Process Time =     0.359 =  110%    Virtual  Memory =     16 MB
Global  Time =     0.326 =  100%    Physical Memory =     14 MB
2644 bytes /c3 /f1 /d8 /n2 662 bytes
total savings 4321894 bytes
total time 15,44 seconds