This ebook explains how shift-left performance engineering brings testing earlier into the SDLC to identify bottlenecks, reduce defects, and speed delivery. It highlights practices such as early load modeling, API-level performance checks, automated test pipelines, and continuous monitoring. It stresses how performance aligned with user experience improves reliability and reduces rework. The document emphasizes integrating performance engineering with DevOps, using synthetic testing, virtualization, and real-time analytics to optimize scalability, ensure resilience, and support modern digital architectures.

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