OptiPNG — optipng.exe -o2

file insize instate stats outsize outstate savings
screenshot.png 37950 bytes /c2 /f0 /n131
Kernel  Time =     0.000 =    0%
User    Time =     0.406 =   97%
Process Time =     0.406 =   97%    Virtual  Memory =      4 MB
Global  Time =     0.415 =  100%    Physical Memory =      8 MB
28648 bytes /c2 /f0 /n2 9302 bytes
screenshot_90.png 95130 bytes /c2 /f0 /n136
Kernel  Time =     0.015 =    3%
User    Time =     0.484 =   97%
Process Time =     0.500 =  100%    Virtual  Memory =      4 MB
Global  Time =     0.496 =  100%    Physical Memory =      7 MB
83762 bytes /c2 /f5 /n4 11368 bytes
screenshot_gradient.png 243541 bytes /c2 /f0 /n179
Kernel  Time =     0.031 =    5%
User    Time =     0.546 =   93%
Process Time =     0.578 =   99%    Virtual  Memory =      4 MB
Global  Time =     0.582 =  100%    Physical Memory =      8 MB
33789 bytes /c2 /f5 /n2 209752 bytes
screenshot_jpg.png 897954 bytes /c2 /f5 /n148
Kernel  Time =     0.000 =    0%
User    Time =     2.718 =   99%
Process Time =     2.718 =   99%    Virtual  Memory =      4 MB
Global  Time =     2.743 =  100%    Physical Memory =      8 MB
829878 bytes /c2 /f0 /n36 68076 bytes
screenshot_lorem.png 156719 bytes /c2 /f0 /n147
Kernel  Time =     0.000 =    0%
User    Time =     1.031 =  100%
Process Time =     1.031 =  100%    Virtual  Memory =      4 MB
Global  Time =     1.024 =  100%    Physical Memory =      8 MB
128358 bytes /c2 /f0 /n5 28361 bytes
screenshot_noise.png 590182 bytes /c2 /f0 /n170
Kernel  Time =     0.000 =    0%
User    Time =    20.843 =   98%
Process Time =    20.843 =   98%    Virtual  Memory =      4 MB
Global  Time =    21.081 =  100%    Physical Memory =      8 MB
469861 bytes /c2 /f0 /n16 120321 bytes
screenshot_pal.png 34862 bytes /c2 /f0 /n131
Kernel  Time =     0.000 =    0%
User    Time =     0.296 =   96%
Process Time =     0.296 =   96%    Virtual  Memory =      4 MB
Global  Time =     0.307 =  100%    Physical Memory =      8 MB
17331 bytes /c3 /f0 /d8 /n1 17531 bytes
screenshot_pics.png 700836 bytes /c2 /f0 /n169
Kernel  Time =     0.000 =    0%
User    Time =     1.937 =   98%
Process Time =     1.937 =   98%    Virtual  Memory =      4 MB
Global  Time =     1.963 =  100%    Physical Memory =      8 MB
514688 bytes /c2 /f5 /n33 186148 bytes
screenshot_webp.png 257269 bytes /c2 /f5 /n33
Kernel  Time =     0.000 =    0%
User    Time =     1.515 =  100%
Process Time =     1.515 =  100%    Virtual  Memory =      4 MB
Global  Time =     1.510 =  100%    Physical Memory =      8 MB
234099 bytes /c2 /f5 /n14 23170 bytes
total savings 674029 bytes
total time 30,12 seconds