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React Performance

Checked
s-hiraoku·vlatest·frontend

Helps with React, performance optimization as part of building frontend UIs and user experiences workflows.

Repository

Install on your platform

Showing Claude Code. One command installs this skill into any of the agents below.

  1. 1

    Run this in your project

    terminal
    $ npx skills add s-hiraoku/synapse-a2a --skill react-performance -a claude-code

  2. Uses the open-source skills CLI and needs Node.js. Add -g to install it for your user instead of this project.

What we know about this skill

Publisher

s-hiraoku

Taken from the source listing. We haven't verified who controls this account.

Install target

Live repository

Not pinned. Installing fetches whatever the repository holds at the time you run the command.

No human has reviewed this code. The checks below are a static scan of the files at one commit — nobody has run this skill or judged whether it works. A skill runs with whatever access you give your agent, so read the source before you install it.

Automated safety checks

scanned

This skill passed all 6 checks. We read its files at one commit and looked for the things that make a skill dangerous to run — not for whether it works.

  • Declares what it does: passed

    SKILL.md parses and declares a name and a description.

    SKILL.md exists, its frontmatter parses, and it declares a name and a description.

  • No undeclared network calls: passed

    Makes no network calls.

    Every host the skill dials — from its scripts, its config endpoints or the commands it tells the agent to run — is either well-known package and API infrastructure or declared in its own frontmatter. Links in documentation are not counted.

  • No obfuscated payloads: passed

    No encoded or obfuscated payloads.

    No base64, hex or compressed blob is decoded and then executed, and no encoded shell commands.

  • No credential access: passed

    Reads no keys, tokens, keychains or credential files.

    Neither the code nor the SKILL.md instructions read SSH keys, cloud credentials, keychains, token stores, browser cookie databases or dotfiles that hold secrets.

  • No pipe-to-shell installers: passed

    No pipe-to-shell or download-and-run installers.

    No `curl … | sh` pattern, in the code or in the instructions, that runs code fetched at run time.

  • Pinned to a commit: passed

    Scanned s-hiraoku/synapse-a2a at 844eb75d92.

    The exact upstream commit SHA that was scanned is recorded, so the result refers to specific bytes.

Commit
844eb75d92
Manifest
.agents/skills/react-performance/SKILL.md
Scanned
3 files, 858 lines
Copies in repo
3 — all of them scanned
This is a static scan, not a review. It reads the skill's files; it does not run them, and it cannot tell you whether the skill is any good or whether the code does what its description says. A skill runs with whatever access you give your agent.
What each check looks for →

About this skill

What it does

This skill provides systematic guidance for optimizing the performance of React and Next.js applications. It focuses on identifying and addressing common bottlenecks, prioritizing improvements based on their impact. The core principle is to reduce blocking operations and minimize bundle size to improve initial load times and overall responsiveness. This helps developers build faster frontend user interfaces and better user experiences.

When to use it

  • When experiencing slow page load times or sluggish interactions in a React/Next.js application.
  • During code reviews to identify potential performance issues.
  • As part of a proactive effort to optimize an existing codebase for improved efficiency.
  • When introducing new features that might impact the overall performance of the application.
  • To understand and implement best practices for asynchronous operations and component loading.

Key capabilities

  • Eliminate Waterfalls: Identifies and resolves sequential async operations, suggesting parallel execution where possible.
  • Suspense Streaming: Provides guidance on using <Suspense> to stream data and render the shell instantly while slow data loads.
  • Partial Dependencies: Explains how to handle promises with partial dependencies to start independent work immediately.
  • Bundle Size Optimization: Offers techniques for reducing bundle size, including direct imports and dynamic imports.
  • Deferred Script Loading: Demonstrates how to defer the loading of non-critical third-party scripts after hydration.
  • Preload on Intent: Suggests preloading resources based on user interactions like hovering or focusing.

Example prompts

  • "How can I parallelize these fetch calls in my Next.js component?"
  • "What's the best way to use Suspense Streaming for a slow data section?"
  • "I'm seeing large bundle sizes; how can I optimize them?"

Tips & gotchas

  • The skill prioritizes addressing sequential asynchronous operations first, as these are often the biggest performance bottlenecks.
  • Be mindful of ssr: false when using dynamic imports – this prevents server-side rendering for client-only components.
  • Direct imports are preferred over barrel files to ensure tree-shaking and reduce bundle size.