DMAIC Phase 3 — Root cause analysis. Takes baseline metrics from /perf-measure and maps them to root causes using pattern matching. Searches the codebase for supporting evidence. Produces a ranked hypothesis list with confidence levels.
DMAIC Phase 4 — Apply targeted fixes. Takes a root cause from /perf-analyze and presents an ordered improvement checklist. Prioritizes battle-tested library substitutions over custom code, then code-level fixes, then architecture changes.
DMAIC Phase 2 — Collect performance data. Routes to the correct measurement tool based on symptom domain (FPS, TTI, bundle, memory, animation). Guides profiling setup, interprets tool output, and produces a structured baseline metrics report.
DMAIC Phase 5 — Prevent regressions. Sets up callstack/reassure for render/interaction benchmarks, configures Flashlight for CI, adds bundle size thresholds, and documents the performance baseline. Use after /perf-improve to lock in gains.
DMAIC Phase 1 — Define the performance problem. Scope the symptom, classify it, set measurable targets, identify the affected user flow, and produce a structured problem statement. Use before measuring to avoid wasted profiling time.
Fast 5-minute React Native performance audit. Scans source for the 12 most impactful antipatterns without profiling — code-level grep scan only. Use as a first pass before deeper DMAIC investigation.