Good summary. I'd also add that 80% of the difficulty is spent on optimizing the last 20% of performance (i.e. the last dB), which is what separates the hobbyi

Good summary. I'd also add that 80% of the difficulty is spent on optimizing the last 20% of performance (i.e. the last dB), which is what separates the hobbyist from the pros, or the art from the quantitative.