schema validation vs. performance

I saw the recent saml-dev thread regarding pros & cons of SAML schema
validation, but I'm not sure what the conclusions were (if any).  Can
someone please summarize?

With the SAML product we're using, we see tremendous performance degradation
when we turn on schema validation.  (Ditto for digital signing.)  Need to
defend its value to justify the impact.

Thanks,
Michael McCormick
System Architect
Wells Fargo Services Company
Enterprise Architecture
100 Washington Avenue South, Suite 606
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