When should performance testing be integrated into the SDLC?

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Performance testing should be integrated early and continuously throughout the Software Development Life Cycle (SDLC) to detect bottlenecks before they become costly. Here's how and when to include it:

1. Requirements Phase:
   Define performance goals (e.g., response time, throughput, concurrent users). These become benchmarks for future testing.

2. Design Phase:
   Assess architecture for performance considerations. Identify components that may affect scalability and responsiveness.

3. Development Phase:
   Start with unit-level performance tests for critical functions. Use profiling tools to optimize code during development.

4. Testing Phase (System & Integration Testing):
   Conduct load, stress, and endurance tests in an environment that mimics production. This is crucial for validating performance under expected and peak loads.

5. Pre-Deployment / Staging:
   Run full-scale performance tests. Simulate real-world scenarios to ensure the app can handle live traffic.

6. Post-Deployment / Monitoring:
   Use APM (Application Performance Monitoring) tools to continuously monitor performance in production and detect regressions early.

7. Agile/DevOps Environments:
   Integrate performance tests into CI/CD pipelines. Run lightweight performance checks with each build to ensure no regressions.

By embedding performance testing throughout the SDLC, teams can ensure the application meets performance expectations, improves user experience, and avoids costly fixes late in the process.

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