Summary
A comprehensive loading performance toolkit that runs diagnostic JavaScript snippets directly in Chrome DevTools to pinpoint what's slowing down your page. It shines with its automated decision trees that chain diagnostics intelligently: slow TTFB triggers sub-part breakdowns, render-blocking detection flows into CSS and script audits, and third-party script analysis follows timing investigations. The 30+ snippets cover everything from TTFB sub-parts (DNS, connection, server) to font optimization, resource hints validation, and SSR hydration overhead. Created by Joan Leon, this is genuinely useful for methodical performance work where you need data-driven answers about what's actually blocking your renders or why your server response is sluggish.
Install to Claude Code
npx -y skills add nucliweb/webperf-snippets --skill webperf-loading --agent claude-codeInstalls into .claude/skills of the current project.
Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
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Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
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Notes, actions and memory. Without a meeting bot. First month 100% off.
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belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →
Free an open-source skills that make AI coding agents easier to understand, verify, and control.
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Connect your Claude agent to live crypto prices and trading routes via 1inch
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Keeps your Mac awake while Claude Code, Codex or Cursor works. Lets it sleep when they are done.
Try free for 7 days →Block distracting apps from your iPhone permanently without a 3rd party app. Free and open source.
Block now (100% free) →Notes, actions and memory. Without a meeting bot. First month 100% off.
Download for free →belt cli automatically finds the best tools and skills for your agent. image, video, music, tts...
one prompt install →Free an open-source skills that make AI coding agents easier to understand, verify, and control.
Download for free →Connect your Claude agent to live crypto prices and trading routes via 1inch
Get the MCP →Categories
First SeenJun 3, 2026
