> So you're suggesting that the Prime class be optimized is that right?
> =r

Oh I see what you're saying--windows 1.8.6 Prime class is slow.  Have
you compared it with Linux?

The good news is that with 1.8 on windows:

      user     system      total        real
my solution  7.891000   0.015000   7.906000 (  7.921875)
library solution 55.094000   0.016000  55.110000 ( 55.265625)

but with 1.9
      user     system      total        real
my solution  2.234000   0.000000   2.234000 (  2.234375)
library solution  0.094000   0.000000   0.094000 (  0.093750)

:)

But test it out on Linux and make sure.

If it's a windows bug then run a profiler against it, fix it, submit a patch [?]

=r