Performance Tuning Overview
l Performance problems occur in a small portion of code
l 4% of application code accounts for more than 50% of the
execution time. - Donald Knuth
l 20% of application code accounts for 80% of the execution time
-  Barry Boehm
l Developers, using guesswork, are notoriously bad at
deciding what code to optimize
l Measuring performance statistics helps developers find
that 4% of code to optimize