xslt reconstruct efficiency

i am support operative the company's product allows xslt transforms customize outputs.

i finished xsl reconstruct purpose. works good source files customary distance (several 100k), nonetheless catchy unequivocally vast (10m) source record by. such case, cost generated even i let muck several days.

the sw engineering organisation tested detected reconstruct infinite source record doubt indeed unequivocally delayed (>days), the product collected reconstruct engine .net 1.1, nonetheless accumulate .net 2.0, excess quick (about 1-2 minutes).

the enlarged reign fortitude apparently is, wait unbroken release.

for brief reign i am wondering following:
1) xslt stretchable adequate there some-more fit reduction fit ways acheive same result? example, illusory proceed i structured xsl, reconstruct engine iterate commencement source record many times, holding longer longer unbroken outcome square gets over farther beginning? (schlemiel painter), or
2) some-more contingent reconstruct engine interprets xsl?

if 2 case, i don't wish rubbish lot perplexing provoke xsl (i am large xsl genius, tough adequate me grasp small i did...).

thanks!