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

file insize instate stats outsize outstate savings
autumn.png 118543 bytes /c3 /f0 /d4 /n18
Kernel  Time =     0.000 =    0%
User    Time =     1.312 =   98%
Process Time =     1.312 =   98%    Virtual  Memory =     17 MB
Global  Time =     1.331 =  100%    Physical Memory =     19 MB
94804 bytes /c3 /f0 /d4 /n7 23739 bytes
cucumber.png 316012 bytes /c3 /f0 /d4 /n41
Kernel  Time =     0.046 =    1%
User    Time =     3.000 =   99%
Process Time =     3.046 =  100%    Virtual  Memory =     35 MB
Global  Time =     3.023 =  100%    Physical Memory =     38 MB
246704 bytes /c3 /f0 /d4 /n9 69308 bytes
dragon.png 78987 bytes /c3 /f0 /d4 /n13
Kernel  Time =     0.015 =    2%
User    Time =     0.750 =   98%
Process Time =     0.765 =  100%    Virtual  Memory =     13 MB
Global  Time =     0.764 =  100%    Physical Memory =     13 MB
67148 bytes /c3 /f0 /d4 /n6 11839 bytes
grass.png 78678 bytes /c3 /f0 /d4 /n41
Kernel  Time =     0.015 =    0%
User    Time =     2.437 =   99%
Process Time =     2.453 =   99%    Virtual  Memory =     22 MB
Global  Time =     2.460 =  100%    Physical Memory =     25 MB
53345 bytes /c3 /f0 /d4 /n5 25333 bytes
hurricane.png 24393 bytes /c3 /f0 /d4 /n6
Kernel  Time =     0.015 =    3%
User    Time =     0.437 =   96%
Process Time =     0.453 =  100%    Virtual  Memory =     12 MB
Global  Time =     0.452 =  100%    Physical Memory =     11 MB
20280 bytes /c3 /f0 /d4 /n2 4113 bytes
palm_tree.png 84251 bytes /c3 /f0 /d4 /n14
Kernel  Time =     0.015 =    1%
User    Time =     1.234 =   99%
Process Time =     1.250 =  100%    Virtual  Memory =     16 MB
Global  Time =     1.244 =  100%    Physical Memory =     17 MB
73380 bytes /c3 /f0 /d4 /n5 10871 bytes
pine_cone.png 122144 bytes /c3 /f0 /d4 /n34
Kernel  Time =     0.031 =    1%
User    Time =     1.703 =   98%
Process Time =     1.734 =  100%    Virtual  Memory =     20 MB
Global  Time =     1.724 =  100%    Physical Memory =     23 MB
94898 bytes /c3 /f0 /d4 /n6 27246 bytes
tomato.png 45011 bytes /c3 /f0 /d4 /n19
Kernel  Time =     0.031 =    3%
User    Time =     0.765 =   96%
Process Time =     0.796 =  100%    Virtual  Memory =     13 MB
Global  Time =     0.789 =  100%    Physical Memory =     14 MB
33746 bytes /c3 /f0 /d4 /n6 11265 bytes
tree.png 29796 bytes /c3 /f0 /d4 /n11
Kernel  Time =     0.015 =    4%
User    Time =     0.328 =   96%
Process Time =     0.343 =  100%    Virtual  Memory =     12 MB
Global  Time =     0.341 =  100%    Physical Memory =      9 MB
24162 bytes /c3 /f0 /d4 /n5 5634 bytes
winter.png 42249 bytes /c3 /f0 /d4 /n18
Kernel  Time =     0.046 =    3%
User    Time =     1.140 =   96%
Process Time =     1.187 =   99%    Virtual  Memory =     15 MB
Global  Time =     1.187 =  100%    Physical Memory =     15 MB
33590 bytes /c3 /f0 /d4 /n6 8659 bytes
total savings 198007 bytes
total time 13,32 seconds