so my X axis list is:

0
1x10e7
2x10e7
3x10e7
4x10e7
5x10e7
6x10e7
7x10e7
8x10e7
9x10e7
1x10e8

##</code><code>##

in previous comment, using this variant:

time perl -e 'for($i=0;$i<=1000;$i++){for($j=0;$j<=1000;$j++){for($k
+=0;$k<=100;$k++){}}}'

have the same time with just using 1 loop with $i=1x10e8