>The only case I've seen where this caused serious performance trouble 
>was when one module was imported (not included) into many others, all at 
>different import precedence.

Well that I've take care of. So seems to be lucky.

>Generally, try to organize your code so each module is included/imported 
>only once (the effect is global).

Luckily, that's the exact way I've done it.

I am using xsltproc [XSLT 1.0] and yet I've not encountered any 
performance issues though was ambiguous.

Thanks for explanation Michael.

Best,
Pankaj