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

file insize instate stats outsize outstate savings
chart1.png 321684 bytes /c2 /f4 /n32
Kernel  Time =     0.000 =    0%
User    Time =     2.453 =  480%
Process Time =     2.453 =  480%    Virtual  Memory =     65 MB
Global  Time =     0.510 =  100%    Physical Memory =     32 MB
250626 bytes /c2 /f0 /n51 71058 bytes
chart2.png 574423 bytes /c2 /f4 /n23
Kernel  Time =     0.046 =    6%
User    Time =     3.343 =  466%
Process Time =     3.390 =  473%    Virtual  Memory =     70 MB
Global  Time =     0.716 =  100%    Physical Memory =     46 MB
505330 bytes /c2 /f5 /n63 69093 bytes
chart3.png 517620 bytes /c2 /f4 /n28
Kernel  Time =     0.015 =    2%
User    Time =     2.734 =  459%
Process Time =     2.750 =  461%    Virtual  Memory =     68 MB
Global  Time =     0.595 =  100%    Physical Memory =     32 MB
440749 bytes /c2 /f0 /n77 76871 bytes
chart4.png 136899 bytes /c2 /f4 /n10
Kernel  Time =     0.031 =    7%
User    Time =     2.171 =  488%
Process Time =     2.203 =  495%    Virtual  Memory =     62 MB
Global  Time =     0.444 =  100%    Physical Memory =     39 MB
124663 bytes /c2 /f5 /n11 12236 bytes
chart5.png 758590 bytes /c2 /f4 /n22
Kernel  Time =     0.015 =    2%
User    Time =     3.031 =  463%
Process Time =     3.046 =  465%    Virtual  Memory =     71 MB
Global  Time =     0.654 =  100%    Physical Memory =     28 MB
555861 bytes /c2 /f0 /n108 202729 bytes
chart6.png 309145 bytes /c2 /f4 /n25
Kernel  Time =     0.062 =   14%
User    Time =     2.062 =  472%
Process Time =     2.125 =  487%    Virtual  Memory =     63 MB
Global  Time =     0.436 =  100%    Physical Memory =     53 MB
261863 bytes /c2 /f0 /n19 47282 bytes
chart7.png 590400 bytes /c2 /f4 /n16
Kernel  Time =     0.031 =    4%
User    Time =     3.781 =  487%
Process Time =     3.812 =  491%    Virtual  Memory =     69 MB
Global  Time =     0.775 =  100%    Physical Memory =     43 MB
467813 bytes /c2 /f0 /n29 122587 bytes
chart8.png 155980 bytes /c2 /f4 /n8
Kernel  Time =     0.046 =   10%
User    Time =     2.203 =  478%
Process Time =     2.250 =  488%    Virtual  Memory =     64 MB
Global  Time =     0.460 =  100%    Physical Memory =     41 MB
122232 bytes /c2 /f0 /n19 33748 bytes
total savings 635604 bytes
total time 4,59 seconds