Comment by jeffreygoesto

I don't have numbers, but the key ingredient is really minimizing context switches. This also results in priority inheritance while message passing which means that a high priority process gets the answer with it's own high priority, even if sending a message to a low priority process. Very smart.

Teading the old open sourced sources can be quite interesting...

https://github.com/vocho/openqnx/tree/master/trunk/lib/qnx43...