Performance Intelligence
Core Web Vitals, transfer budgets, request pressure, cache signals, and the first optimization worth shipping.
Developer performance platform
Understand, improve, and prove website performance faster.
PerfLens turns DevTools context, Core Web Vitals, SEO checks, accessibility findings, and audit history into clear next steps for developers reviewing a web release.
What it is
A Chrome DevTools extension for fast performance, SEO, and accessibility reviews.
Who it helps
Frontend developers, product builders, and reviewers who need practical release evidence.
Why trust it
Local-first audits, narrow permissions, product screenshots, changelog, and open-source paths.
Open-source readyChrome extensionLocal-first auditsEvidence exports
94
Performance audit score
4
Core Web Vitals tracked
3
Evidence export paths
0
Remote data storage by default
Production audit
Performance
94
+12 from last audit
SEO
91
3 metadata checks passed
Accessibility
87
2 contrast issues
Performance trend
Last 8 deploy audits
LCP
1.8s
Good
INP
96ms
Good
CLS
0.04
Stable
TTFB
420ms
Watch
SEO + accessibility
Semantic headings96%
Alt coverage92%
Structured data88%
Optimization queue
Preload dashboard hero image for faster LCP.
Defer analytics bundle until first interaction.
Add accessible names to icon-only export actions.
Render-blocking CSS
310ms
High impact
Missing image dimensions
4 nodes
Layout stability
Duplicate meta description
2 pages
SEO cleanup
01 / Overview
A credible product surface for performance-focused engineering
PerfLens is positioned as a serious developer platform: clear problem framing, realistic product UI, visible trust signals, technical depth, and open-source contribution paths.
01
Productized user journey
The page now presents PerfLens as a complete developer workflow: discover, audit, prioritize, export, and contribute.
02
Open-source confidence
GitHub, issue creation, contribution guidance, release notes, and roadmap signals are visible without burying users.
03
Portfolio-grade evidence
Screenshots, architecture notes, permissions, and changelog content support product maturity and Tech Nation-style evidence.
02 / Architecture
Clean product architecture that explains how trust is earned
A mature developer platform needs more than a good-looking dashboard. PerfLens explains the browser surface, analysis engine, and evidence layer in a way that technical evaluators can scan quickly.
Browser extension
Chrome DevTools workflow with active-tab execution and narrow permissions.
Audit engine
Performance, SEO, accessibility, network, and best-practice checks converted into developer signals.
Evidence layer
Local history, exportable reports, and concise summaries designed for engineering review loops.
03 / Installation
Install, inspect, and verify in a developer-native workflow
The setup flow is designed for credibility: a public distribution path, local development instructions, and a clear route into the GitHub project.
Chrome Web Store
Open the PerfLens listing, add the extension to Chrome, then pin it for quick access during audits.
Open Chrome Web Store# Local development workflow
npm install
npm run build
# Chrome
# Extensions -> Developer mode -> Load unpacked -> select the extension build folder04 / Product Capabilities
Feature depth that feels like a real developer product
PerfLens presents concrete engineering workflows instead of vague marketing claims: scoring, diagnostics, prioritization, DevTools context, and exportable evidence.
Prioritized Issue Detection
Image, script, CSS, SEO, accessibility, and best-practice findings ranked by developer impact.
DevTools-Native Workflow
Run audits where developers already inspect problems, using active-tab and network context responsibly.
Evidence-Ready Reports
Export clear audit summaries for pull requests, issue trackers, portfolio evidence, and stakeholder reviews.
05 / Developer Trust
Narrow permissions, transparent data handling, clear intent
A credible browser extension must explain what it touches and why. PerfLens frames each permission around a practical audit responsibility and keeps the trust model visible.
Active Tab
Allows PerfLens to audit the current page only when you run it from the extension.
Scripting
Injects lightweight checks into the inspected page so runtime metrics can be collected.
Storage
Keeps recent audits and settings locally, including history views and export preferences.
DevTools
Reads network context in supported sessions to explain requests, cache policy, and transfer behavior.
06 / Evidence
Built for portfolio review, open-source credibility, and Tech Nation evidence
The page now surfaces product maturity signals that evaluators can understand quickly: production surface, technical depth, and community readiness.
1
Production surface
Published Chrome Web Store pathway, polished landing page, and product screenshots.
2
Technical depth
Performance scoring, web vitals, network-aware audits, and recommendation logic.
3
Community readiness
Contribution checklist, issue flow, roadmap, changelog, and repository links.
07 / Product UI
A polished extension experience with real interface evidence
Screenshots make the product tangible. They show the actual dashboard, production audit state, opportunities, history, and export workflow.
08 / Reliability
Operational clarity for developers adopting the tool
Mature developer products anticipate setup friction and explain likely causes without hand-waving.
The audit has no network data
Refresh HAR, reload the target page, then run the audit again so PerfLens can observe the request waterfall.
Scores look different from Lighthouse
PerfLens is optimized for quick developer feedback from DevTools context, so use it as a fast review layer beside deeper lab testing.
Local app prompts are unavailable
Run the app in a local development environment and ensure the inspected tab is the active Chrome tab.
09 / Changelog
Release history that signals active product development
Clear release notes show that PerfLens is moving through real product iterations rather than existing as a static portfolio mockup.
0.3.0 - Export and history workflow
Added report export flows, audit history, and evidence-oriented summaries.
0.2.0 - Opportunities and prioritization
Expanded issue detection across performance, SEO, accessibility, and asset quality.
0.1.0 - Initial audit dashboard
Introduced the core DevTools audit dashboard and scorecard workflow.
10 / Open Source
Contribution pathways for credibility and community growth
The project presents a clear path for issues, pull requests, verification notes, and product-quality contributions.
Contribution checklist
- Open an issue with the audit scenario and expected outcome.
- Add tests or manual verification notes for scoring changes.
- Keep UI states accessible, responsive, and keyboard friendly.
- Update screenshots and changelog entries when behavior changes.