OptiPNG — optipng.exe -o7

file insize instate stats outsize outstate savings
chart1.png 321684 bytes /c2 /f4 /n32
Kernel  Time =     0.015 =    0%
User    Time =    12.937 =   99%
Process Time =    12.953 =   99%    Virtual  Memory =      3 MB
Global  Time =    13.026 =  100%    Physical Memory =      7 MB
259098 bytes /c2 /f0 /n5 62586 bytes
chart2.png 574423 bytes /c2 /f4 /n23
Kernel  Time =     0.031 =    0%
User    Time =    21.406 =   99%
Process Time =    21.437 =   99%    Virtual  Memory =      4 MB
Global  Time =    21.512 =  100%    Physical Memory =      7 MB
520983 bytes /c2 /f5 /n11 53440 bytes
chart3.png 517620 bytes /c2 /f4 /n28
Kernel  Time =     0.062 =    0%
User    Time =    20.000 =   99%
Process Time =    20.062 =   99%    Virtual  Memory =      4 MB
Global  Time =    20.105 =  100%    Physical Memory =      7 MB
451062 bytes /c2 /f0 /n20 66558 bytes
chart4.png 136899 bytes /c2 /f4 /n10
Kernel  Time =     0.093 =    1%
User    Time =     7.562 =   98%
Process Time =     7.656 =   99%    Virtual  Memory =      3 MB
Global  Time =     7.676 =  100%    Physical Memory =      7 MB
129501 bytes /c2 /f5 /n8 7398 bytes
chart5.png 758590 bytes /c2 /f4 /n22
Kernel  Time =     0.093 =    0%
User    Time =    25.421 =   99%
Process Time =    25.515 =   99%    Virtual  Memory =      4 MB
Global  Time =    25.612 =  100%    Physical Memory =      7 MB
572176 bytes /c2 /f0 /n25 186414 bytes
chart6.png 309145 bytes /c2 /f4 /n25
Kernel  Time =     0.031 =    0%
User    Time =    12.875 =   99%
Process Time =    12.906 =   99%    Virtual  Memory =      3 MB
Global  Time =    12.952 =  100%    Physical Memory =      6 MB
268743 bytes /c2 /f0 /n12 40402 bytes
chart7.png 590400 bytes /c2 /f4 /n16
Kernel  Time =     0.031 =    0%
User    Time =    21.859 =   99%
Process Time =    21.890 =   99%    Virtual  Memory =      4 MB
Global  Time =    21.939 =  100%    Physical Memory =      7 MB
483004 bytes /c2 /f0 /n21 107396 bytes
chart8.png 155980 bytes /c2 /f4 /n8
Kernel  Time =     0.046 =    0%
User    Time =     9.015 =   99%
Process Time =     9.062 =   99%    Virtual  Memory =      4 MB
Global  Time =     9.087 =  100%    Physical Memory =      7 MB
125606 bytes /c2 /f0 /n6 30374 bytes
total savings 554568 bytes
total time 131,91 seconds