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

file insize instate stats outsize outstate savings
blue.png 2378 bytes /c2 /f5 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.187 =  156%
Process Time =     0.187 =  156%    Virtual  Memory =     22 MB
Global  Time =     0.119 =  100%    Physical Memory =     16 MB
2378 bytes - -
gray.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.109 =  135%
Process Time =     0.109 =  135%    Virtual  Memory =     22 MB
Global  Time =     0.080 =  100%    Physical Memory =     13 MB
2386 bytes /c3 /f5 /d8 /n2 5196 bytes
green.png 7582 bytes /c3 /f0 /d8 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.171 =  167%
Process Time =     0.171 =  167%    Virtual  Memory =     21 MB
Global  Time =     0.102 =  100%    Physical Memory =     15 MB
2386 bytes /c3 /f5 /d8 /n2 5196 bytes
multi.png 629573 bytes /c2 /f0 /n257
Kernel  Time =     0.000 =    0%
User    Time =     0.468 =  150%
Process Time =     0.468 =  150%    Virtual  Memory =     32 MB
Global  Time =     0.310 =  100%    Physical Memory =     21 MB
5672 bytes /c2 /f5 /n11 623901 bytes
multi-alpha.png 796228 bytes /c6 /f0 /n257
Kernel  Time =     0.531 =   33%
User    Time =     2.453 =  154%
Process Time =     2.984 =  187%    Virtual  Memory =     62 MB
Global  Time =     1.591 =  100%    Physical Memory =     48 MB
54297 bytes /c6 /f5 /n18 741931 bytes
multi-avg.png 96663 bytes /c2 /f4 /n257
Kernel  Time =     0.046 =   10%
User    Time =     0.625 =  143%
Process Time =     0.671 =  154%    Virtual  Memory =     29 MB
Global  Time =     0.434 =  100%    Physical Memory =     19 MB
14105 bytes /c2 /f5 /n11 82558 bytes
multi-cq.png 92377 bytes /c2 /f4 /n3
Kernel  Time =     0.046 =    7%
User    Time =     0.890 =  135%
Process Time =     0.937 =  143%    Virtual  Memory =     29 MB
Global  Time =     0.655 =  100%    Physical Memory =     25 MB
62850 bytes /c2 /f5 /n11 29527 bytes
purple.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.015 =   12%
User    Time =     0.187 =  149%
Process Time =     0.203 =  161%    Virtual  Memory =     30 MB
Global  Time =     0.125 =  100%    Physical Memory =     18 MB
2386 bytes /c3 /f5 /d8 /n2 1573613 bytes
purple-noise.png 1575999 bytes /c2 /f0 /n0
Kernel  Time =     0.031 =    4%
User    Time =     1.062 =  138%
Process Time =     1.093 =  142%    Virtual  Memory =     34 MB
Global  Time =     0.769 =  100%    Physical Memory =     31 MB
332512 bytes /c2 /f5 /n8 1243487 bytes
red-alpha.png 3306 bytes /c6 /f4 /n1
Kernel  Time =     0.000 =    0%
User    Time =     0.187 =  145%
Process Time =     0.187 =  145%    Virtual  Memory =     23 MB
Global  Time =     0.129 =  100%    Physical Memory =     14 MB
2653 bytes /c3 /f5 /d8 /n2 653 bytes
total savings 4306062 bytes
total time 4,31 seconds