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

file insize instate stats outsize outstate savings
lorem.png 135614 bytes /c2 /f0 /n63
Kernel  Time =     0.000 =    0%
User    Time =     0.734 =  178%
Process Time =     0.734 =  178%    Virtual  Memory =     25 MB
Global  Time =     0.410 =  100%    Physical Memory =     19 MB
105679 bytes /c2 /f0 /n16 29935 bytes
lorem_90.png 483089 bytes /c2 /f0 /n106
Kernel  Time =     0.031 =    9%
User    Time =     0.578 =  170%
Process Time =     0.609 =  179%    Virtual  Memory =     26 MB
Global  Time =     0.339 =  100%    Physical Memory =     15 MB
451970 bytes /c2 /f0 /n56 31119 bytes
lorem_big.png 127451 bytes /c2 /f0 /n3
Kernel  Time =     0.015 =    2%
User    Time =     0.937 =  148%
Process Time =     0.953 =  151%    Virtual  Memory =     26 MB
Global  Time =     0.630 =  100%    Physical Memory =     16 MB
68797 bytes /c0 /f0 /d8 /n26 58654 bytes
lorem_big_16.png 65084 bytes /c0 /f0 /d8 /n28
Kernel  Time =     0.015 =    3%
User    Time =     0.781 =  161%
Process Time =     0.796 =  164%    Virtual  Memory =     24 MB
Global  Time =     0.483 =  100%    Physical Memory =     20 MB
46626 bytes /c0 /f0 /d8 /n12 18458 bytes
lorem_big_17.png 65551 bytes /c0 /f0 /d8 /n35
Kernel  Time =     0.000 =    0%
User    Time =     0.781 =  163%
Process Time =     0.781 =  163%    Virtual  Memory =     24 MB
Global  Time =     0.478 =  100%    Physical Memory =     19 MB
45954 bytes /c0 /f0 /d8 /n13 19597 bytes
lorem_big_noise.png 823706 bytes /c2 /f0 /n82
Kernel  Time =     0.062 =    3%
User    Time =     3.187 =  173%
Process Time =     3.250 =  177%    Virtual  Memory =     33 MB
Global  Time =     1.833 =  100%    Physical Memory =     28 MB
613790 bytes /c2 /f0 /n59 209916 bytes
lorem_gray.png 140439 bytes /c2 /f0 /n123
Kernel  Time =     0.031 =    9%
User    Time =     0.500 =  149%
Process Time =     0.531 =  158%    Virtual  Memory =     24 MB
Global  Time =     0.334 =  100%    Physical Memory =     16 MB
56668 bytes /c0 /f0 /d8 /n6 83771 bytes
lorem_image.png 133069 bytes /c2 /f0 /n3
Kernel  Time =     0.031 =    4%
User    Time =     1.171 =  179%
Process Time =     1.203 =  184%    Virtual  Memory =     30 MB
Global  Time =     0.653 =  100%    Physical Memory =     22 MB
117411 bytes /c2 /f0 /n33 15658 bytes
lorem_noise.png 542244 bytes /c2 /f0 /n67
Kernel  Time =     0.000 =    0%
User    Time =     1.546 =  171%
Process Time =     1.546 =  171%    Virtual  Memory =     27 MB
Global  Time =     0.901 =  100%    Physical Memory =     19 MB
428159 bytes /c2 /f0 /n84 114085 bytes
lorem_pal.png 121950 bytes /c2 /f0 /n73
Kernel  Time =     0.000 =    0%
User    Time =     0.515 =  149%
Process Time =     0.515 =  149%    Virtual  Memory =     23 MB
Global  Time =     0.344 =  100%    Physical Memory =     17 MB
51835 bytes /c0 /f0 /d8 /n6 70115 bytes
total savings 651308 bytes
total time 6,41 seconds