How fast is ActiveMQ?
It all depends on the configuration, the operating system, hardware, JVM, JVM configuration and what you're doing. For more details see Performance
If you're not convinced by performance reports then please do try running performance tests yourself. You might wanna check out our overview of Performance or try using out the ActiveMQ Performance Module Users Manual
The Commercial Providers on the Support page may also be able to help diagnose performance issues, suggest changes, etc...