Thanks for the post. One question: One of the advantages about having a clean design is that performance is easier to optimize, since the 80%/20% rule of perfo

Thanks for the post. One question: One of the advantages about having a clean design is that performance is easier to optimize, since the 80%/20% rule of performance becomes much more obvious. How true was this in your experience? Were there any major performance-related design changes or was performance optimization a matter of tuning a few selected functions?