When you have a performance problem, you might be able to find that it is characterized by one of the following symptoms, each of which represents a particular processing bottleneck. If so, turn directly to the relevant section:
If you are only aware that performance is poor, and you have not yet found which of these is relevant to your system, read Finding the bottleneck.
There is a quick reference section at the end of this section (A summary of performance bottlenecks, symptoms, and causes) that summarizes bottlenecks, symptoms, and actions that you should take.