What's the fastest XSL-FO renderer out there...

I intend to use XSL-FO to generate potentially tens of  thousands of pages
in PDF format.  Not necessarily all in one go, probably a couple of hundred
at a time.  I am testing all my scripts using FOP which I have noted is
rather slow.

Anybody have any idea what other renders are out there which can churn out
pages any quicker than FOP?  Any recommendations?





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