Performance Regression Debugging

When your app suddenly slows down after a deployment, this walks you through comparing baseline metrics against current performance, identifying what changed, and fixing it. It covers the full cycle: detecting regressions through measurement (response times, memory usage, bundle size), profiling to find the root cause, verifying your fixes actually work, and setting up prevention so it doesn't happen again. The approach is systematic rather than guessing. You get reference guides for each phase plus patterns for continuous monitoring. Best used when you have metrics showing degradation and need a structured debugging process rather than ad hoc investigation.