There are laws and principals that govern concurrency and performance.
Performance can be built, fueled and/or tuned.
How do we measure performance and capacity in abstract terms?
Capacity (throughput) and Load are often used interchangeably but incorrectly.
What is the difference between Resource utilization and saturation?
How performance & capacity are measured on a live system (CPU & Memory)?
Find out how is your system being used or abused?
Find out how your system is performing as a whole?
Find out how a particular process in the system is performing?
Find out how a particular thread in the process performing?
Find out the bottle-necks? What is less or missing?