This passage discusses four best practices for preventing application performance incidents, using Ticketmaster's website crash during Taylor Swift's Eras Tour presale as a case study. It highlights the importance of setting clear performance testing objectives, testing under realistic conditions, improving root-cause analysis through continuous monitoring, and validating test environments regularly. The Ticketmaster crash resulted from overwhelming traffic spikes, and the guide explains how to avoid similar incidents by establishing clear performance criteria, response time targets, and incorporating realistic load projections into testing.

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