Part I Preliminary Concepts.- Why Queues Rule Performance Analysis.- Measurement Tools and Techniques.- Time - The Zeroth Performance Metric.- Part II Basic Queueing Theory for PDQ.- Getting the Jump on Queueing.- Queueing Systems for Computer Systems.- Linux Load Average.- Performance Bounds and Log Jams.- Part III Practical Application of PDQ.- Pretty Damn QuickA Slow Introduction.- Multicomputer Analysis with PDQ.- How to Scale an Elephant with PDQ.- Client/Server Analysis with PDQ.- Web Application Analysis with PDQ.- Virtual Machine Analysis with PDQ.- Part IV Appendices.- Thanks for No Memories.- Compendium of Queueing Equations.- Units and Abbreviations.- Perl PDQ Manual.- Solutions to Selected Exercises.