[jdom-interest] A Fast Way to Merge Documents

[Aleksi Kallio]

We read stuff from database to JDOM Documents and then merge them together to make content of a web-page (through XSLT-translation). 

We use
    doc1.getRootElement().addContent(doc2.getRootElement().getCopy("doc2"));

to merge documents. This seems to be very slow (because of copying?). 

What would be the FAST way to combine two documents? After all, it could be just changing a few references. The answer could also be a bit of hack... 

Are there any articles or references to JDOM performance issues?