It's more about knowing your constraints ahead of time and working within them. If you're doing audio mixing, for instance, you probably have a thread that has

It's more about knowing your constraints ahead of time and working within them. If you're doing audio mixing, for instance, you probably have a thread that has to respond with samples within 1ms. Missing the window means catastrophic audio glitches. (it sounds terrible) It's a mistake to write this in Ruby and expect the profiler to tell you something you don't already know.