WSO2 ESB 4.8.1 has continued to outperform all other compared ESBs in almost all scenarios. The latest round of performance testing results has been published by WSO2: WSO2 ESB Performance Round 7.5 These latest performance study has been conducted with the latest release of WSO2 ESB 4.8.1. It compares WSO2 ESB performance against a number of leading open source ESBs. Results show the latest WSO2 ESB convincingly outperforms all other open-source ESBs, like in the case of the previous round (6.5). Observations