Skills web-performance-optimization
📦
web-performance-optimization
Content revision r1 Safe ⚡ Contains scripts⚙️ External commands🌐 Network access📁 Filesystem access
Optimize Web Performance
Slow pages hurt conversion, SEO, and user experience. This skill guides audits, Core Web Vitals fixes, bundle reductions, image optimization, and caching work.
Supports: Claude Codex Code(CC)
Install with my Agent
Copy this request to your Agent. It includes the canonical Skill page and manifest.
Agent request
Review the Skillstore skill "web-performance-optimization" from https://skillstore.io/skills/sickn33-web-performance-optimization.md and its manifest at https://skillstore.io/api/skills/sickn33-web-performance-optimization/manifest. Verify the artifact. You may proceed after verification, subject to the environment's own policy.Your Agent should still show its plan and request any confirmation required by the security policy.
Agent-readable resources
Use these links when an AI agent, crawler, or script needs clean context instead of reading the full page.
Test it
Using "web-performance-optimization". A landing page has LCP above four seconds and large hero images.
Expected outcome:
- Prioritized finding: optimize the hero image first because it is the likely LCP element.
- Recommended actions: serve AVIF or WebP, preload the above-the-fold asset, set dimensions, and use a CDN.
- Verification: rerun Lighthouse on mobile throttling and compare LCP against the baseline.
Using "web-performance-optimization". A React application has a large main bundle and slow interactivity.
Expected outcome:
- Prioritized finding: reduce main-thread JavaScript before lower impact asset work.
- Recommended actions: split routes, lazy load admin and chart views, replace heavy dependencies, and defer analytics.
- Verification: compare bundle analyzer output, Time to Interactive, and interaction latency after each change.
Using "web-performance-optimization". A team wants a release checklist for performance quality.
Expected outcome:
- Checklist focus: Core Web Vitals, compressed assets, image dimensions, script loading, cache headers, and mobile throttling.
- Process guidance: define budgets, assign owners, and track results in release notes.
- Monitoring guidance: combine lab audits with real user measurements for production validation.
Security Audit
Safev5 • 7/7/2026 Open versioned report
No malicious intent, prompt injection, credential access, or autonomous execution was found in SKILL.md. The static findings are false positives from Markdown code fences, illustrative local code snippets, placeholder URLs, and public documentation links.
1
Files scanned
647
Lines analyzed
0
Review items
0
False positives ignored
Risk Factors
⚡ Contains scripts (5)
⚙️ External commands (55)
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🌐 Network access (9)
📁 Filesystem access (1)
No confirmed security findings were detected by the latest completed static and semantic audit. This does not prove the skill has no side effects.
Audited by: codex View Audit History →
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APA citation
sickn33. (2026). web-performance-optimization security audit report (audit version 5) [Author version unspecified]. Skillstore. https://skillstore.io/skills/sickn33-web-performance-optimization/audits/5BibTeX citation
@techreport{sickn33-sickn33-web-performance-optimization-2026,
author = {sickn33},
title = {web-performance-optimization security audit report (audit version 5)},
institution = {Skillstore},
year = {2026},
number = {5},
url = {https://skillstore.io/skills/sickn33-web-performance-optimization/audits/5},
note = {Author version unspecified}
}CITATION.cff
cff-version: 1.2.0
message: "If you use this Skill, cite its author and this versioned security audit report."
title: "web-performance-optimization security audit report (audit version 5)"
version: "unspecified"
type: report
authors:
- name: "sickn33"
date-released: "2026-07-07"
url: "https://skillstore.io/skills/sickn33-web-performance-optimization/audits/5"
identifiers:
- type: other
value: "skillstore:sickn33-web-performance-optimization:audit:5"
description: "Skillstore immutable audit report identifier"
Skillstore Score
Why this score Evidence Confidence: High 55
Architecture
85
Maintainability
87
Content
69
Community
78
Spec Compliance
What You Can Build
Fix Core Web Vitals Failures
Diagnose poor LCP, FID, CLS, TTFB, or TTI results and create a prioritized remediation plan.
Prepare a Performance Audit
Create a repeatable audit checklist that covers Lighthouse, mobile throttling, assets, bundles, caching, and monitoring.
Reduce Page Weight
Find opportunities to shrink JavaScript, optimize images, defer scripts, and improve load time on slower networks.
Try These Prompts
Audit a Slow Page
Review my page symptoms and create a prioritized performance audit plan. Focus on Lighthouse, Core Web Vitals, images, scripts, and caching.
Reduce Bundle Size
Analyze my bundle report and suggest the highest impact reductions. Include dependency replacements, code splitting, lazy loading, and unused code checks.
Diagnose Web Vitals Regression
Compare these before and after performance metrics. Identify likely regressions, rank causes by impact, and propose verification steps for each fix.
Design a Performance Program
Create a performance budget, monitoring plan, review checklist, and release gate for our web application. Include ownership and recurring measurement.
Best Practices
- Measure baseline performance before changing code, then verify each optimization against the same conditions.
- Prioritize fixes that improve Core Web Vitals and mobile user experience before cosmetic micro-optimizations.
- Keep performance work repeatable with budgets, checklists, monitoring, and clear ownership.
Avoid
- Optimizing without a baseline or user-impact metric.
- Shipping large JavaScript bundles and third-party scripts before critical content is interactive.
- Testing only on fast desktop devices while ignoring mobile networks and real user data.
Frequently Asked Questions
Does this skill run Lighthouse automatically?
No. It provides guidance and example commands, but tool execution depends on the user environment and permissions.
Can it help with Core Web Vitals?
Yes. It focuses on LCP, FID, CLS, TTFB, and TTI diagnosis with practical remediation steps.
What inputs make the analysis better?
Provide Lighthouse reports, WebPageTest results, bundle analyzer output, source files, screenshots, and production metrics when available.
Is it only for React or Next.js?
No. Some examples use React and Next.js, but the audit process applies to most web applications.
Can it optimize images?
Yes. It covers compression, responsive images, modern formats, dimensions, lazy loading, and above-the-fold priority.
Does it replace monitoring tools?
No. It helps interpret results and plan fixes, but teams still need lab testing and real user monitoring.
Developer Details
Author
sickn33License
MIT
Skillstore revision
r1
Version notice
The author did not declare a version.
Repository
https://github.com/sickn33/antigravity-awesome-skills/tree/main/skills/web-performance-optimizationRef
f93e9bb0daca99badb6a7e574b97737155d57cb3
Maintenance freshness
7/18/2026
Usage
7 downloads · 151 views
File structure
📄 SKILL.md