If you want to see how performant OH can be, you really shouldn’t be using Rules DSL. You should use Scripted Automation with Jython, JavaScript, or Groovy. I know for sure that Jython and JavaScript are much faster and do not rely upon a limited thread pool the way Rules DSL does. You should get one or two orders of magnitude better performance out of Jython (for example) than Rules DSL.
Though, as has been said, OH is not a real time system. It’s not going to meet your requirements even with that speed up in Rules execution.