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Install in OpenClaw
/install webperf-loading
Description
Intelligent loading performance analysis with automated workflows for TTFB investigation (DNS/connection/server breakdown), render-blocking detection, script...
Usage Guidance
This skill runs JavaScript inside Chrome DevTools to inspect page loading performance. Review the snippets if you want to ensure they only read page state (DOM, performance entries) — which they do. A few snippets use fetch to load stylesheet text from URLs referenced by the page (expected for CSS analysis). It will not request local credentials or install binaries, but it will run code inside your browser session and may expose results via window functions. If you plan to run it against sensitive production pages, consider testing on a non‑production copy first and review any snippets you plan to run manually. The repository and author are linked in SKILL.md (https://github.com/nucliweb/webperf-snippets); if you need higher assurance, inspect the specific scripts you intend to use.
Capability Analysis
Type: OpenClaw Skill
Name: webperf-loading
Version: 0.1.0
The webperf-loading skill bundle is a comprehensive collection of web performance auditing tools based on the reputable 'nucliweb/webperf-snippets' repository. The JavaScript files (e.g., TTFB.js, Script-Loading.js, SSR-Hydration-Data-Analysis.js) use standard browser Performance and DOM APIs to collect metrics and identify optimization opportunities like render-blocking resources or oversized hydration data. While some scripts like SSR-Hydration-Data-Analysis.js scan for sensitive keywords (e.g., 'password', 'apikey') in serialized state, they do so for auditing purposes without any evidence of data exfiltration or malicious intent.
Capability Assessment
Purpose & Capability
Name/description describe loading/TTFB/render-blocking analysis and the package contains numerous browser-side JS snippets and an MCP-oriented SKILL.md that instructs the agent to evaluate those snippets in Chrome DevTools — this is coherent and expected.
Instruction Scope
SKILL.md explicitly instructs the agent to run scripts via mcp__chrome-devtools__evaluate_script and to capture results; scripts access only DOM, Performance API, history, and in a few cases fetch stylesheet text from page-linked URLs. They do not instruct reading local files, unrelated env vars, or posting data to unknown external endpoints.
Install Mechanism
Instruction-only skill (no install spec). Code files are JS snippets intended to run inside the browser via DevTools; nothing is downloaded or executed on the host outside the DevTools context.
Credentials
The skill declares no required environment variables, binaries, or credentials — consistent with browser-side DevTools snippets that operate on page state.
Persistence & Privilege
always:false and no install/persistence steps. Scripts sometimes register window functions (e.g., checkBfcache, getDataFn patterns) to expose tracked results, which is normal for tracking scripts and limited to the page context. The skill does not request system-wide privileges or modify other skills.
How to Use
- Make sure OpenClaw is installed (local or Docker)
- Run the install command in chat:
/install webperf-loading - After installation, invoke the skill by name or use
/webperf-loading - Provide required inputs per the skill's parameter spec and get structured output
Version History
v0.1.0
Initial release of webperf-loading: a comprehensive toolkit for automated analysis and optimization of web loading performance.
- Provides workflows for TTFB investigation, render-blocking detection, script performance attribution, font optimization, and resource hints validation.
- Includes decision trees for automated analysis based on measurement results.
- Features over 25 specialized scripts for deep-dive audits across loading, network, script, font, image, CSS, and SSR performance.
- Supports integration with Core Web Vitals, Interaction, and Media webperf skills.
- Compatible with Chrome DevTools MCP for automated JavaScript evaluation and result capture.
Metadata
Frequently Asked Questions
What is Webperf Loading?
Intelligent loading performance analysis with automated workflows for TTFB investigation (DNS/connection/server breakdown), render-blocking detection, script... It is an AI Agent Skill for Claude Code / OpenClaw, with 253 downloads so far.
How do I install Webperf Loading?
Run "/install webperf-loading" in the OpenClaw or Claude Code chat to install it in one step — no extra setup required.
Is Webperf Loading free?
Yes, Webperf Loading is completely free, licensed under MIT-0. You can download, install and use it at no cost.
Which platforms does Webperf Loading support?
Webperf Loading is cross-platform and runs anywhere OpenClaw / Claude Code is available (cross-platform).
Who created Webperf Loading?
It is built and maintained by nucliweb (@nucliweb); the current version is v0.1.0.
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