I would think there's something in your code that makes the
performance quadratic (or worse) with respect to source
document size. This is nothing to do with XSLT, it's to do
with your own code. To test this theory, try plotting how the
stylesheet performance varies as you increase the document
size: 1Mb, 2Mb, 4Mb, 8Mb.
As another test of this theory, try running an identity transform on the
same source document. The only difference between the identity transform and
your own stylesheet is your code: so if the identity transform runs 1000
times faster, it's your code you need to look at.
Michael Kay
http://www.saxonica.com/
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