oxipng — oxipng.exe -o 6 --libdeflater --threads 1 --alpha --strip all

file insize instate stats outsize outstate savings
screenshot.png 37950 bytes /c2 /f0 /n131
Kernel  Time =     0.046 =    3%
User    Time =     1.156 =   96%
Process Time =     1.203 =  100%    Virtual  Memory =     26 MB
Global  Time =     1.200 =  100%    Physical Memory =     24 MB
27873 bytes /c2 /f0 /n14 10077 bytes
screenshot_90.png 95130 bytes /c2 /f0 /n136
Kernel  Time =     0.000 =    0%
User    Time =     1.015 =   99%
Process Time =     1.015 =   99%    Virtual  Memory =     23 MB
Global  Time =     1.016 =  100%    Physical Memory =     22 MB
80635 bytes /c2 /f5 /n25 14495 bytes
screenshot_gradient.png 243541 bytes /c2 /f0 /n179
Kernel  Time =     0.015 =    1%
User    Time =     1.375 =  100%
Process Time =     1.390 =  101%    Virtual  Memory =     27 MB
Global  Time =     1.373 =  100%    Physical Memory =     25 MB
32085 bytes /c2 /f5 /n14 211456 bytes
screenshot_jpg.png 897954 bytes /c2 /f5 /n148
Kernel  Time =     0.015 =    0%
User    Time =     2.000 =   98%
Process Time =     2.015 =   99%    Virtual  Memory =     30 MB
Global  Time =     2.034 =  100%    Physical Memory =     27 MB
792798 bytes /c2 /f0 /n125 105156 bytes
screenshot_lorem.png 156719 bytes /c2 /f0 /n147
Kernel  Time =     0.046 =    2%
User    Time =     2.203 =   97%
Process Time =     2.250 =   99%    Virtual  Memory =     26 MB
Global  Time =     2.267 =  100%    Physical Memory =     24 MB
123571 bytes /c2 /f0 /n36 33148 bytes
screenshot_noise.png 590182 bytes /c2 /f0 /n170
Kernel  Time =     0.031 =    0%
User    Time =     5.781 =   99%
Process Time =     5.812 =   99%    Virtual  Memory =     29 MB
Global  Time =     5.818 =  100%    Physical Memory =     31 MB
423893 bytes /c2 /f0 /n52 166289 bytes
screenshot_pal.png 34862 bytes /c2 /f0 /n131
Kernel  Time =     0.015 =    2%
User    Time =     0.671 =  101%
Process Time =     0.687 =  104%    Virtual  Memory =     17 MB
Global  Time =     0.659 =  100%    Physical Memory =     15 MB
16791 bytes /c3 /f0 /d8 /n7 18071 bytes
screenshot_pics.png 700836 bytes /c2 /f0 /n169
Kernel  Time =     0.015 =    0%
User    Time =     1.906 =   98%
Process Time =     1.921 =   99%    Virtual  Memory =     30 MB
Global  Time =     1.928 =  100%    Physical Memory =     28 MB
505460 bytes /c2 /f5 /n23 195376 bytes
screenshot_webp.png 257269 bytes /c2 /f5 /n33
Kernel  Time =     0.015 =    0%
User    Time =     2.062 =   99%
Process Time =     2.078 =  100%    Virtual  Memory =     27 MB
Global  Time =     2.072 =  100%    Physical Memory =     26 MB
216924 bytes /c2 /f5 /n44 40345 bytes
total savings 794413 bytes
total time 18,37 seconds