Enforces performance coding rules for queries, caching, frontend assets, and concurrency.
npx skills add https://github.com/hellowind777/helloagents --skill hello-perf
Please help me install this Agent Skill. Skill: hello-perf Source: https://github.com/hellowind777/helloagents/tree/main/skills/hello-perf Command: npx skills add https://github.com/hellowind777/helloagents --skill hello-perf
Code often ships with hidden performance problems like N+1 database queries, unpaginated large datasets, unoptimized images, and O(n²) loops that only surface under production load. This Skill gives the AI a concrete performance checklist so these issues are caught and prevented during code generation rather than after deployment.
Ask the AI to review or write performance-sensitive code such as a database-backed list endpoint, and it will apply these optimization rules and run the delivery checklist.
High-intent search queries and answers about installing and using this skill.
Replace per-item queries with JOINs, batch loading, or a dataloader pattern so related records are fetched in one round trip. This Skill instructs the AI to apply these patterns automatically whenever it writes data-access code.
Cache read-heavy, write-light data in memory or Redis with a reasonable TTL. Prefer write-time invalidation over timed expiry, and guard against cache penetration with null-value caching and avalanches with randomized TTLs.
Use virtual scrolling for lists over 50 items, route-level code splitting with lazy loading, and serve images as WebP/AVIF with lazy loading, responsive srcset, and declared width/height to prevent layout shift.
Apply debounce or throttle to high-frequency events like scroll, resize, and input so handlers do not fire on every event. This keeps the UI responsive and avoids redundant computation or network calls.
Nested loops produce O(n²) or worse time complexity, which becomes unusable on large datasets. Use Map or Set for O(1) lookups instead of Array.includes, and prefer batch operations over per-item processing.
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