We are upgrading the hivemq3 version to the hivemq4 version, but the performance of the hivemq4 version is not up to the hivem3 version.
Our 3 version conf.xm configuration is like this：
The performance at this time Can provide 30,000/s inbound publish rate.
However, on the same machine, using hivemq4.2.1 version, the inbound publish rate at this time is only 1700/s, how to configure hivemq4.2.1 to achieve the same or close performance as version 3. (As far as I know, hivemq4 version has removed the “in memory” configuration)