OptiPNG — optipng.exe -o2

file insize instate stats outsize outstate savings
lorem.png 135614 bytes /c2 /f0 /n63
Kernel  Time =     0.000 =    0%
User    Time =     0.968 =   98%
Process Time =     0.968 =   98%    Virtual  Memory =      4 MB
Global  Time =     0.983 =  100%    Physical Memory =      7 MB
111108 bytes /c2 /f0 /n5 24506 bytes
lorem_90.png 483089 bytes /c2 /f0 /n106
Kernel  Time =     0.000 =    0%
User    Time =     2.156 =   98%
Process Time =     2.156 =   98%    Virtual  Memory =      3 MB
Global  Time =     2.179 =  100%    Physical Memory =      7 MB
460656 bytes /c2 /f0 /n23 22433 bytes
lorem_big.png 127451 bytes /c2 /f0 /n3
Kernel  Time =     0.015 =    0%
User    Time =     1.656 =   99%
Process Time =     1.671 =  100%    Virtual  Memory =      5 MB
Global  Time =     1.669 =  100%    Physical Memory =      9 MB
72878 bytes /c0 /f0 /d8 /n3 54573 bytes
lorem_big_16.png 65084 bytes /c0 /f0 /d8 /n28
Kernel  Time =     0.000 =    0%
User    Time =     1.171 =  100%
Process Time =     1.171 =  100%    Virtual  Memory =      3 MB
Global  Time =     1.166 =  100%    Physical Memory =      6 MB
55162 bytes /c3 /f5 /d4 /n3 9922 bytes
lorem_big_17.png 65551 bytes /c0 /f0 /d8 /n35
Kernel  Time =     0.000 =    0%
User    Time =     1.250 =   99%
Process Time =     1.250 =   99%    Virtual  Memory =      3 MB
Global  Time =     1.254 =  100%    Physical Memory =      6 MB
49893 bytes /c0 /f0 /d8 /n2 15658 bytes
lorem_big_noise.png 823706 bytes /c2 /f0 /n82
Kernel  Time =     0.000 =    0%
User    Time =    49.796 =   99%
Process Time =    49.796 =   99%    Virtual  Memory =      5 MB
Global  Time =    50.144 =  100%    Physical Memory =      9 MB
656550 bytes /c2 /f0 /n22 167156 bytes
lorem_gray.png 140439 bytes /c2 /f0 /n123
Kernel  Time =     0.015 =    2%
User    Time =     0.531 =   98%
Process Time =     0.546 =  101%    Virtual  Memory =      4 MB
Global  Time =     0.540 =  100%    Physical Memory =      7 MB
60615 bytes /c0 /f0 /d8 /n2 79824 bytes
lorem_image.png 133069 bytes /c2 /f0 /n3
Kernel  Time =     0.015 =    1%
User    Time =     1.203 =   96%
Process Time =     1.218 =   97%    Virtual  Memory =      5 MB
Global  Time =     1.250 =  100%    Physical Memory =      9 MB
118496 bytes /c2 /f0 /n5 14573 bytes
lorem_noise.png 542244 bytes /c2 /f0 /n67
Kernel  Time =     0.015 =    0%
User    Time =    23.546 =   99%
Process Time =    23.562 =   99%    Virtual  Memory =      4 MB
Global  Time =    23.683 =  100%    Physical Memory =      7 MB
460359 bytes /c2 /f0 /n17 81885 bytes
lorem_pal.png 121950 bytes /c2 /f0 /n73
Kernel  Time =     0.000 =    0%
User    Time =     0.515 =   98%
Process Time =     0.515 =   98%    Virtual  Memory =      4 MB
Global  Time =     0.525 =  100%    Physical Memory =      7 MB
56273 bytes /c0 /f0 /d8 /n2 65677 bytes
total savings 536207 bytes
total time 83,39 seconds