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

file insize instate stats outsize outstate savings
screenshot.png 37950 bytes /c2 /f0 /n131
Kernel  Time =     0.031 =    8%
User    Time =     1.703 =  447%
Process Time =     1.734 =  455%    Virtual  Memory =     69 MB
Global  Time =     0.380 =  100%    Physical Memory =     45 MB
27873 bytes /c2 /f0 /n14 10077 bytes
screenshot_90.png 95130 bytes /c2 /f0 /n136
Kernel  Time =     0.062 =   17%
User    Time =     1.390 =  396%
Process Time =     1.453 =  414%    Virtual  Memory =     67 MB
Global  Time =     0.350 =  100%    Physical Memory =     37 MB
80635 bytes /c2 /f5 /n25 14495 bytes
screenshot_gradient.png 243541 bytes /c2 /f0 /n179
Kernel  Time =     0.031 =    7%
User    Time =     1.875 =  423%
Process Time =     1.906 =  430%    Virtual  Memory =     71 MB
Global  Time =     0.442 =  100%    Physical Memory =     45 MB
32085 bytes /c2 /f5 /n14 211456 bytes
screenshot_jpg.png 897954 bytes /c2 /f5 /n148
Kernel  Time =     0.062 =   10%
User    Time =     2.718 =  441%
Process Time =     2.781 =  451%    Virtual  Memory =     77 MB
Global  Time =     0.616 =  100%    Physical Memory =     37 MB
792798 bytes /c2 /f0 /n125 105156 bytes
screenshot_lorem.png 156719 bytes /c2 /f0 /n147
Kernel  Time =     0.031 =    5%
User    Time =     3.062 =  492%
Process Time =     3.093 =  497%    Virtual  Memory =     70 MB
Global  Time =     0.622 =  100%    Physical Memory =     39 MB
123571 bytes /c2 /f0 /n36 33148 bytes
screenshot_noise.png 590182 bytes /c2 /f0 /n170
Kernel  Time =     0.015 =    1%
User    Time =     7.765 =  505%
Process Time =     7.781 =  506%    Virtual  Memory =     74 MB
Global  Time =     1.536 =  100%    Physical Memory =     73 MB
423893 bytes /c2 /f0 /n52 166289 bytes
screenshot_pal.png 34862 bytes /c2 /f0 /n131
Kernel  Time =     0.031 =   13%
User    Time =     0.906 =  403%
Process Time =     0.937 =  416%    Virtual  Memory =     61 MB
Global  Time =     0.224 =  100%    Physical Memory =     28 MB
16791 bytes /c3 /f0 /d8 /n7 18071 bytes
screenshot_pics.png 700836 bytes /c2 /f0 /n169
Kernel  Time =     0.031 =    5%
User    Time =     2.671 =  443%
Process Time =     2.703 =  448%    Virtual  Memory =     75 MB
Global  Time =     0.603 =  100%    Physical Memory =     51 MB
505460 bytes /c2 /f5 /n23 195376 bytes
screenshot_webp.png 257269 bytes /c2 /f5 /n33
Kernel  Time =     0.000 =    0%
User    Time =     2.812 =  440%
Process Time =     2.812 =  440%    Virtual  Memory =     71 MB
Global  Time =     0.638 =  100%    Physical Memory =     46 MB
216924 bytes /c2 /f5 /n44 40345 bytes
total savings 794413 bytes
total time 5,41 seconds