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Performance Optimizer

Checked
nahisaho·vlatest·frontend·MIT

Automatically optimizes frontend code for speed and efficiency using advanced analysis and targeted refactoring techniques.

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 nahisaho/musubi --skill performance-optimizer -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

nahisaho

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 nahisaho/musubi at d9c21f4529.

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

Commit
d9c21f4529
Manifest
.claude/skills/performance-optimizer/SKILL.md
Scanned
6 files, 2,161 lines
Copies in repo
2 — 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

The nahisaho-performance-optimizer skill analyzes and suggests improvements to frontend code for better performance. It identifies potential bottlenecks in JavaScript execution, CSS rendering, and asset loading. The tool aims to reduce page load times and improve overall user experience by optimizing critical sections of the codebase.

When to use it

  • Slow website pages: Use this skill when users report slow loading times or sluggish interactions on a frontend application.
  • Large JavaScript bundles: Identify opportunities to code-split, tree-shake, or lazy load large JavaScript files.
  • Complex CSS animations: Optimize computationally expensive CSS animations that impact rendering performance.
  • High-resolution images: Suggest optimized image formats and sizes for faster downloads.

Key capabilities

  • JavaScript execution profiling
  • CSS rendering analysis
  • Asset loading optimization suggestions
  • Code splitting recommendations
  • Image optimization guidance

Example prompts

  • "Analyze the performance of my homepage and suggest improvements."
  • "Identify any slow JavaScript functions on this page."
  • "How can I optimize these CSS animations?"
  • "Suggest ways to reduce the size of my JavaScript bundle."

Tips & gotchas

The skill's effectiveness depends on providing it with access to the relevant frontend code. It may require integration with build tools or deployment pipelines for automated analysis and optimization suggestions.