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

file insize instate stats outsize outstate savings
blue.png 2378 bytes /c2 /f5 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.156 =   97%
Process Time =     0.156 =   97%    Virtual  Memory =     13 MB
Global  Time =     0.160 =  100%    Physical Memory =     12 MB
2378 bytes - -
gray.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.015 =   13%
User    Time =     0.093 =   80%
Process Time =     0.109 =   94%    Virtual  Memory =     13 MB
Global  Time =     0.115 =  100%    Physical Memory =     11 MB
2386 bytes /c3 /f5 /d8 /n2 5196 bytes
green.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.031 =   26%
User    Time =     0.078 =   66%
Process Time =     0.109 =   93%    Virtual  Memory =     12 MB
Global  Time =     0.116 =  100%    Physical Memory =     11 MB
2386 bytes /c3 /f5 /d8 /n2 5196 bytes
multi.png 629573 bytes /c2 /f0 /n257
Kernel  Time =     0.015 =    3%
User    Time =     0.453 =   96%
Process Time =     0.468 =   99%    Virtual  Memory =     23 MB
Global  Time =     0.469 =  100%    Physical Memory =     21 MB
5672 bytes /c2 /f5 /n11 623901 bytes
multi-alpha.png 796228 bytes /c6 /f0 /n257
Kernel  Time =     0.578 =   23%
User    Time =     1.875 =   75%
Process Time =     2.453 =   99%    Virtual  Memory =     31 MB
Global  Time =     2.474 =  100%    Physical Memory =     29 MB
54297 bytes /c6 /f5 /n18 741931 bytes
multi-avg.png 96663 bytes /c2 /f4 /n257
Kernel  Time =     0.031 =    4%
User    Time =     0.609 =   94%
Process Time =     0.640 =   99%    Virtual  Memory =     19 MB
Global  Time =     0.641 =  100%    Physical Memory =     18 MB
14105 bytes /c2 /f5 /n11 82558 bytes
multi-cq.png 92377 bytes /c2 /f4 /n3
Kernel  Time =     0.000 =    0%
User    Time =     0.906 =   99%
Process Time =     0.906 =   99%    Virtual  Memory =     20 MB
Global  Time =     0.906 =  100%    Physical Memory =     20 MB
62850 bytes /c2 /f5 /n11 29527 bytes
purple.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.015 =   11%
User    Time =     0.156 =  111%
Process Time =     0.171 =  123%    Virtual  Memory =     19 MB
Global  Time =     0.139 =  100%    Physical Memory =     16 MB
2386 bytes /c3 /f5 /d8 /n2 1573613 bytes
purple-noise.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.015 =    1%
User    Time =     1.062 =   98%
Process Time =     1.078 =   99%    Virtual  Memory =     24 MB
Global  Time =     1.080 =  100%    Physical Memory =     25 MB
332512 bytes /c2 /f5 /n8 1243487 bytes
red-alpha.png 3306 bytes /c6 /f4 /n1
Kernel  Time =     0.015 =    8%
User    Time =     0.187 =   99%
Process Time =     0.203 =  107%    Virtual  Memory =     14 MB
Global  Time =     0.188 =  100%    Physical Memory =     12 MB
2653 bytes /c3 /f5 /d8 /n2 653 bytes
total savings 4306062 bytes
total time 6,29 seconds