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harrissohail6harrissohail6/claude-code-config/skills/performance-tuning/SKILL.md

performance-tuning

Skill1 starsChanged 11 months agoMITView on GitHub

Performance optimization techniques. Auto-activates when discussing slow code, optimization, or performance issues.

We split this skill into the rules it gives an agent

1 rule. 0 are common, 1 is distinctive, and 0 are very specific to this project.

  • 0

    Common

    Most of the 6 edited versions we read keep these.

  • 1

    Distinctive

    This author's own choices. Worth a look.

  • 0

    Very specific

    Tied to their project's names, files or tools. Probably skip.

  • Common
  • Distinctive
  • Very specific
  1. Distinctive:

    Always profile before optimizing:

    line 9

“Common” is measured: kept by at least 6 in 10 of the 6 edited versions of this file we could read. “Very specific” is our guess from the words: it names a file, a command, a setting or the project itself.

Keep what fits and drop the rest. Your version, ready for your agents.
Files
SKILL.md

Performance Tuning

Measure First

Always profile before optimizing:

  • Browser DevTools Performance tab
  • Node.js: --inspect or clinic.js
  • Database: EXPLAIN ANALYZE

Database Optimization

Indexing

-- Index frequently queried columns
CREATE INDEX idx_users_email ON users(email);

-- Composite index for multi-column queries
CREATE INDEX idx_orders_user_date ON orders(user_id, created_at);

Query Optimization

-- Avoid SELECT *
SELECT id, name, email FROM users;

-- Use LIMIT
SELECT * FROM logs ORDER BY created_at DESC LIMIT 100;

-- Batch operations
INSERT INTO users (name) VALUES ('a'), ('b'), ('c');

JavaScript Optimization

React Performance

// Memoize expensive components
const MemoizedList = React.memo(ExpensiveList);

// Memoize callbacks
const handleClick = useCallback(() => {}, [deps]);

// Memoize computed values
const total = useMemo(() => items.reduce(...), [items]);

// Virtualize long lists
<VirtualizedList items={items} />

General JS

// Debounce frequent events
const debouncedSearch = debounce(search, 300);

// Use appropriate data structures
const map = new Map(); // O(1) lookup vs array O(n)
const set = new Set(); // O(1) has vs array includes O(n)

Caching

  • HTTP caching headers
  • Redis/Memcached for hot data
  • CDN for static assets
  • Query result caching

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