Thank Grant for verify it, do not take it seriously. I can not assume that I know everything.
For example in 2003, I worked as consultant in Title company in Ohio. One DBA wanted me to help him for his usp_ that took ~ 5 minutes to run, I made it to ~ 1 minute to run but it called one system stored procedure, manager happy about that. But VP did not like that , he called Microsoft and change that system stored procedure, after change the job took only 15 seconds to run and that opened my eye. Up until now, I still do not know how he changed it but it was changed . From that time, I open myself to any info.
Some kind of naive but I learn something new everyday.