Claude Code setups for performance

Example prompts

Concrete things you can type into Claude Code for performance. Each example uses a real skill, agent, slash command, hook, or MCP server listed below.

1. Benchmark before refactoring a hot path

   Use the perf-benchmark skill to measure src/lib/render.ts and save baseline numbers to bench/baseline.json.

2. Profile a slow Postgres query

   Use the sql-optimizer skill with the Postgres MCP server to EXPLAIN ANALYZE the orders dashboard query and propose an index.

3. Guard against bundle-size regressions

   Enable the bundle-size-check hook with a 5% budget on the main entry chunk.

4. Eliminate unnecessary React re-renders

   Use the performance-optimizer agent to find re-renders in src/components/Dashboard and propose memoization.