A first-party React and Next.js performance reference for reviewing data loading, bundle cost, rendering and component behavior.
Editorial review checked 2026-10-29 against this instruction snapshot. Supporting scripts and runtime behavior remain outside this editorial review.
This collection supplies prioritized performance guidance for React applications and Next.js projects. It covers several layers of the request-to-interface path, helping an agent look beyond a single component and consider how data fetching, JavaScript delivery and rendering interact. Its practical value is in structuring a review around likely user-visible costs before reaching for small local optimizations.
Teams building or maintaining React interfaces, reviewing a slow page, or refactoring components whose behavior and loading patterns have become difficult to understand. Use it alongside the project's actual framework version, performance traces and deployment constraints so the advice addresses the environment that users run.
A guideline is a hypothesis for a particular codebase, not evidence that an optimization improved it. Framework APIs and caching semantics change, and an aggressive refactor can alter behavior. Verify current documentation for the installed version, preserve accessibility and loading states, and measure a representative workload before accepting performance claims.
Unknown; inspect source requirements and supporting scripts.
Inspect the pinned source snapshot and its supporting files first. The command selects this skill through the open-source skills CLI. Node.js and agent-specific setup may be required. Installation can download code. Catalog ingestion never executes skill instructions or install scripts.
npx skills add https://github.com/vercel-labs/agent-skills/tree/1a2c79d4e6c4a2283dc2c614b6538cbe1ed5ca62/skills/react-best-practices --skill vercel-react-best-practicesReview pinned skill folder ↗ · CLI documentation ↗
After source review, use npx skills check and npx skills update to inspect and apply upstream updates. Re-check changed instructions before running them.
Static review only. This is not a security audit or a guarantee of safety.
SKILL.md text only; scripts, dependencies and runtime behavior not audited.
No configured text patterns matched. Unmatched or concealed behavior can still exist.
Allowed tools declaration: Unknown. Runtime permissions and network behavior: Unknown.
78/100 · Metadata coverage 80% · Model 1.0
Scores summarize observable discovery signals. Popularity and repository activity apply to the whole repository. Unknown runtime safety earns no certification.
Capture the important user journey and its baseline, review expensive data and bundle boundaries first, make one focused improvement, then measure the same journey again. Combine it with a browser-testing skill for interaction regressions and with a design review for layout and accessibility.
Compare the same input, device class and relevant timing or bundle metric before and after. Confirm that the interface still handles loading, errors and keyboard interaction correctly.
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Move from a deliberate design direction to a performance review and a browser check of the real user journey.