Just read the article "Streaming XPath Parser for WSO2 ESB". I was wondering how much the performance increases with this implementation compared to the previous implementation.
Are there any numbers available on this?
This is the results of the latest performance test round done for the newly released WSO2 ESB 4.6.0 which uses the streaming XPath implementation and many more improvements. This compares ESB 4.6.0's performance with its previous release an also with some other ESBs. You will find this very interesting. Latest ESB pack is available here.