Last week we published the results of the Round #5 of ESB Performance Testing, and we've already had feedback to improve the configurations for some of the ESBs.
Of-course, we would be happy to work with other ESB vendors to ensure that the ESB configuration resources now hosted publicly at https://bitbucket.org/adroitlogic/esbperformance is optimal for each ESB compared in both configuration and performance tuning details.
We've just published detailed instructions for re-executing the Round #5 on an EC2 node - read about it here on http://esbperformance.org