web-performance

A peer-reviewed knowledge base for frontend engineering decisions, trade-offs, and production-ready practices.

An Awwwards-inspired online converter tool to minify, beautify, denest, and nest CSS code according to the latest CSS specs. Built with zero framework...

🦃 Black Friday Performance Testing Experiment 🙏

AI-powered SEO and CRO auditing platform with automated technical checks, content analysis, UX insights, and smart reporting.

Slides and demo for PerfJankie/BrowserPerf

MPA-First Development Mandate | Guiding principles for building performant, resilient Multi-Page Applications. Focus on native web platform strengths,...

The fastest Node framework on this 🌎 🚀 🚀 🚀

Pagespeed Monitoring - A simple tool to monitor Front-End regression using Google Pagespeed Insight and Regular Expressions.

:tv: :tv: Side by side video playing for webpagetest / browsertime recordings.

The official interactive Pokedex showcase for the Pokémon 3D API. Featuring 1,300+ models with real-time animation switching, generation filtering, an...

⚡ Next.js storefront for high-performance eCommerce with AI features and one-click deployment

Lightweight and framework-agnostic PHP library to calculate web page carbon emissions based on real-time parameters. No external API required — ideal...

CDP-powered perf CLI: goes beyond Lighthouse scores, builds causal degradation graphs. Tells you why it's slow, not just that it is.

AI-layer web performance optimization using PageSpeed Insights — one command to analyze, report, and fix

GitHub Action that stores and analyzes Lighthouse CI reports

Monitoring tooling agnostic Express Application Server in-process performance monitoring middleware and agent

Projekt för att kontinuerligt övervaka en webbplats mätbara kvalitetsfaktorer.

Browsertime Garie plugin. Polls websites to checkout performance metrics also supports webhooks.

Real User Performance Monitoring

Free Claude Code QA skills for accessibility, performance, SEO, security, privacy, test review, and code review. Install from skills.sh.

Measure web page performance metrics with ease.

Sample project advocating for web workers, Comlink and .... making the UI thread great again

Plug’n'Play stack for testing and monitoring web applications from user perspective.

Practical Cloudflare Worker tools for analytics and diagnostics

A curated list of awesome resources for optimizing web performance.

Sitespeed.io web performance test scheduler and management agent

⚡ Lighthouse for your API calls. 13 audit rules, Vue & React DevTools, network-adjusted scoring.

Your website has problems you can't see. Scry finds them. Crawl your entire website across SEO, security, performance, and accessibility. No browser,...

AI-ready PageSpeed Insights & Lighthouse CLI for Core Web Vitals audits, performance fixes, SEO optimization, and before/after verification.

Truthful user experience and browsing performances monitoring.

Talk with a list of Web Performance Tooling.

A console tool to losslessly optimize PNG, JPEG and GIF files, using gifsicle, jpegoptim, jpegtran, pngcrush and pngout. It can usually reduce the fil...

🙈 Codelab for running Lighthouse to test a page behind authentication flow

Reproducible research toolkit for benchmarking AVIF, JPEG XL, WebP, and JPEG on web images with perceptual quality metrics, statistical analysis, visu...

A curated list of awesome resources, tools, and tips to improve web performance.

A cinematic parallax scrolling experience powered by GSAP. Features high-performance motion orchestration, multi-layered depth planes, and hardware-ac...

PWA ready responsive html/css template

Chrome extension (Manifest V3) that audits a page's images for technical SEO & performance issues - alt text, dimensions, file size, next-gen formats...

⚡ How to eliminate render-blocking JavaScript and CSS, Dec 2016

A talk about lazy-loading with React-like HOC

📝 Web performance notes from Google I/O 2019

A small extension that facilitates access to web performance analysis tools

A beginner-friendly SEO guide covering image optimization, Core Web Vitals, cache headers, technical SEO, CDN usage, JavaScript fixes, and modern fron...

Free WordPress plugin to optimize Core Web Vitals (LCP, INP, CLS). Compatible with Elementor, WP Rocket, and all major themes

Ultimate Next.js Portfolio Template 2026 | SEO-Optimized, Tailwind CSS, TypeScript, & Dark Mode - Ready in Minutes.

Collection of open source tools for web performance testing and optimization

Type-safe Python HAR model: Pydantic-powered parsing, validation, normalization, and transformation—readying HTTP Archive data for analytics and easy...

This is the demo project for improve web vital metrics. It's a simple site with a lot of bad practices.

Turn Lighthouse audits into coding-agent tasks.

Performance debugging tool for AdOps and Developers to analyze .har network logs. It automatically isolates ad-tech requests, calculates latency metri...