JDOM performance

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I'm evaluating the Beta 8 version of JDOM on the iSeries. So far I've
written a few test classes and am very impressed with its capabilities for
reading and writing XML documents. However, I've read that JDOM loads the
whole document tree into memory and keeps it there until output. I'm not
sure how the iSeries memory management handles this but there seems
reasonable cause for concern.

I am testing transformations between XML and DB2/400 in both directions.
So far, using small test files which have worked fine but later I will
need to handle files containing several thousand records.

Has anyone got any experience using JDOM with large files? I am interested
in the performance and if JDOM is slow (and slows down the machine) then I
will consider going back to SAX and DOM but coding with JDOM is a whole
lot easier!

Thanks,

Keith