FOP 0.20.5 versus FOP 0.92 performance

I have generated large PDF reports on a Solaris 10 server running Java 1.5.0_01 for FOP release 0.20.5 and 0.92 Beta and findings are as follows:-

1) FOP 0.92 Beta appears to be freeing up memory rapidly after .pdf generation whereas FOP 0.20.5 does not.

2) FOP 0.92 Beta appears to use up significantly more memory in the generation of the .pdf (circa 60% in the case of a big report)

3) The .pdf reports are taking significantly longer to create (between 50% and 100%) with the FOP 0.92.

4) The resultant .pdf file size created with FOP .92 Beta is significantly larger than the FOP 0.20.5 as it has increased from 6.42MB to 12.5MB.

5) There are no forward-references in the XSLT file to improve performance.

Are these results to be expected?

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