As Keiron said that performance increased with just using HashMap instead of Hashtable. How about using ArrayList instead of Vector? Well, it depends on how much Vector is used in FOP. Another thought is the way the FO tree and area trees are implemented. There will be probably some changes with the redesign. However, the approach taken by Xalan may also be useful in FOP. In Xalan 2, the DOM has been replaced by DTM (Document Table Model) which uses tables of integers to represent the document, reducing all comparisons (of node names, etc.) to integer comparisons. Of course, Xalan benefits mostly with the faster XPath axis iterators of this implementation which are not relevant to FOP. Nevetherless, if not performance, DTM or the appropiate for FOP offers a lot of savings on memory usage. Just a few thoughts, it may trigger some ideas.
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