xinclude performance issues

[Raymond <support@bigriverinfotech.com>]

docbook-dtd-4.5b1 docbook-xsl-1.69.1 jdk-1.5.0_4, kubuntu-5.04 oXygen-6.1 
saxon-6.5.4

Have issues with slow validations and subsequent transformations of documents 
utilizing substantial xincludes.

Discussions with users of other popular IDEs (both windows and java) resulted 
in similar conclusions irregardless of  saxon, xalan or xsltproc processors: 
xincludes are SLOW and processor intensive. A 120 document validation or 
transformation with substantial nested xincludes take some 10 minutes on a 
1.7g cpu 1.25g mem centrino notebook.  The cpu hovers at 90-99% during these 
validations or transformations.

xincludes / xpointers are essential to my document projects.

Any advice on how to optimize a large document validation and/or 
transformation with substantial nested xincludes / xpointers???

Raymond