To investigate performance bottleneck, Wait Statistics is a power full tool which a DBA like to use on priority. Understanding waits is not that difficult but the way books and blog entries describe, makes it more complicated.
This is first out of 5 videos series. A simple way to understand internals of WAITS and how they can effectively be used to resolve SQL Server performance problems.
SQL Server Performance Tuning with Wait Statistics (Introduction) from aasim abdullah on Vimeo.