performance questions

Hi, all.

I developed a testing framework based on ruby language.

and now, I want to upgrade performance of the tool.

first candidate way is using compiler.

but, I can't find out an available library for all platforms (linux,  
windows, hp, aix, dec, ...)

second candidate way is code optimization.

this one is always .. always under my concerning. I mean there are no  
big differences before and after.

third way is .....

could suggest some kinds of cool and nice way?

the most important thing is a multiple-platform supportable. :)