OptiPNG — optipng.exe -o2

file insize instate stats outsize outstate savings
chart1.png 321684 bytes /c2 /f4 /n32
Kernel  Time =     0.031 =    2%
User    Time =     1.281 =   96%
Process Time =     1.312 =   98%    Virtual  Memory =      3 MB
Global  Time =     1.326 =  100%    Physical Memory =      7 MB
259232 bytes /c2 /f0 /n10 62452 bytes
chart2.png 574423 bytes /c2 /f4 /n23
Kernel  Time =     0.000 =    0%
User    Time =     1.921 =   98%
Process Time =     1.921 =   98%    Virtual  Memory =      4 MB
Global  Time =     1.941 =  100%    Physical Memory =      7 MB
520998 bytes /c2 /f5 /n22 53425 bytes
chart3.png 517620 bytes /c2 /f4 /n28
Kernel  Time =     0.015 =    0%
User    Time =     1.843 =   98%
Process Time =     1.859 =   99%    Virtual  Memory =      3 MB
Global  Time =     1.873 =  100%    Physical Memory =      7 MB
451062 bytes /c2 /f0 /n20 66558 bytes
chart4.png 136899 bytes /c2 /f4 /n10
Kernel  Time =     0.000 =    0%
User    Time =     0.781 =   99%
Process Time =     0.781 =   99%    Virtual  Memory =      3 MB
Global  Time =     0.786 =  100%    Physical Memory =      6 MB
129501 bytes /c2 /f5 /n8 7398 bytes
chart5.png 758590 bytes /c2 /f4 /n22
Kernel  Time =     0.000 =    0%
User    Time =     2.843 =   99%
Process Time =     2.843 =   99%    Virtual  Memory =      4 MB
Global  Time =     2.858 =  100%    Physical Memory =      7 MB
572176 bytes /c2 /f0 /n25 186414 bytes
chart6.png 309145 bytes /c2 /f4 /n25
Kernel  Time =     0.000 =    0%
User    Time =     0.968 =   99%
Process Time =     0.968 =   99%    Virtual  Memory =      3 MB
Global  Time =     0.973 =  100%    Physical Memory =      6 MB
268743 bytes /c2 /f0 /n12 40402 bytes
chart7.png 590400 bytes /c2 /f4 /n16
Kernel  Time =     0.000 =    0%
User    Time =     2.250 =   98%
Process Time =     2.250 =   98%    Virtual  Memory =      4 MB
Global  Time =     2.273 =  100%    Physical Memory =      7 MB
483004 bytes /c2 /f0 /n21 107396 bytes
chart8.png 155980 bytes /c2 /f4 /n8
Kernel  Time =     0.000 =    0%
User    Time =     0.968 =   99%
Process Time =     0.968 =   99%    Virtual  Memory =      3 MB
Global  Time =     0.969 =  100%    Physical Memory =      7 MB
125606 bytes /c2 /f0 /n6 30374 bytes
total savings 554419 bytes
total time 13,00 seconds