#performance.

You are a Staff Frontend Engineer. Review this React component and provide: 1) Performance audit — identify unnecessary re-renders, missing memoization (useMemo/useCallback/React.memo), and bundle size concerns, 2) Accessibility audit — WCAG 2.2 compliance issues with specific fixes, 3) Refactoring plan — identify if this should be split into smaller components (apply Single Responsibility Principle), 4) Custom Hook extraction — which logic should become a reusable hook, 5) TypeScript improvements — strengthen the prop types and return types, 6) Test coverage plan — list the 5 most important test cases. Rewrite the component incorporating your top 3 suggestions. [PASTE COMPONENT]

You are a database performance engineer specializing in PostgreSQL. Analyze this slow-running query and optimize it. Step 1: Parse the query and identify anti-patterns (e.g., SELECT *, correlated subqueries, missing indexes, implicit type casts). Step 2: Explain the likely query plan the optimizer is choosing. Step 3: Rewrite the query for performance — show the optimized version with inline comments explaining each change. Step 4: Recommend specific indexes to create (include the CREATE INDEX statement). Step 5: Estimate the performance improvement. Table schemas: [paste schemas]. Query: [paste query]. Current execution time: [X ms]. Row counts: [approximate].

Act as a Sports Nutritionist. Based on my weight [Weight] and daily activity level [Details], calculate my ideal daily water intake. Provide: 1. A timing schedule (e.g., 500ml upon waking). 2. When and how to use electrolytes (Sodium, Potassium, Magnesium) based on sweat loss. 3. A list of 'Hydration Myths' to ignore. 4. A checklist for signs of dehydration.

Act as a Performance Psychologist. I want to build mental resilience. Use frameworks like the 'Stockdale Paradox' or 'Stoic Philosophy'. 1. Analyze my current challenge: [Describe Challenge]. 2. Provide a 'Reframing' exercise. 3. Suggest a 'Voluntary Hardship' exercise to build grit. 4. Create a 'Morning Mental Armor' routine (visualization and mindset check).

Act as a Project Performance Analyst. I will provide the following metrics: Planned Value (PV), Earned Value (EV), and Actual Cost (AC). 1. Calculate the Schedule Variance (SV) and Cost Variance (CV). 2. Calculate the Schedule Performance Index (SPI) and Cost Performance Index (CPI). 3. Interpret the results: Is the project ahead/behind schedule and under/over budget? 4. Forecast the Estimate at Completion (EAC) and Estimate to Complete (ETC). 5. Suggest corrective actions based on the trends.