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Performance Checklist is a GitHub repository or organization with source code, releases, documentation, or project resources.
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codspeed.io
CodSpeed provides continuous performance testing for CI. It runs benchmarks in the CI pipeline, reports regressions in pull requests, and offers autonomous performance optimization. A documentation quickstart describes connecting a repository and setting up benchmarks, either through an automated wizard or manual configuration, including plugins for languages such as Python and C++.
frontendchecklist.io
Front-End Checklist provides front-end quality rules for humans and AI agents. It offers over 350 rules across 11 categories, including accessibility, CSS, HTML, performance, security, privacy, and SEO. Curated checklists cover launch, SEO audit, performance, and accessibility reviews. The rules can also be connected to AI tools through an MCP server. Team features are listed as coming soon.
gtmetrix.com
GTmetrix checks page speed, performance, technical issues, and web quality signals.
tools.pingdom.com
Pingdom's free Website Speed Test analyzes a webpage's load time and identifies bottlenecks. A full page test breaks requests into stages such as DNS lookup, SSL handshake, connect, send, wait, receive and blocked, and flags redirects and 4xx or 5xx responses. Pingdom also offers uptime and performance monitoring from more than 70 global polling locations.
programming-language-benchmarks.vercel.app
A site offering side-by-side comparisons of programming languages and their compilers or runtimes. Benchmark tests are executed in a single CI job, and the static website is regenerated once a change is merged into the main branch. It aims to compare performance differences between languages and between compilers or runtimes of the same language.
3v4l.org
An online PHP shell that runs submitted code on the site's server across more than 500 compiled PHP versions. For each script it reports output from released versions and upcoming alpha, beta and release candidate builds, performance in time and memory, and VLD opcode output.
github.com
cloudflare speed cli is a command-line tool for running internet speed tests and checking connection performance.
fast.com
Fast.com is a simple internet speed testing tool. It estimates a user's download speed in seconds, with support for dozens of languages. The tool also offers optional metrics including upload speed, loaded and unloaded latency, and configurable parallel connection and test duration settings for more detailed network performance checks.
api.webprobe.org
NetBlocks provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
ooni.org
OONI, the Open Observatory of Network Interference, is a global community measuring internet censorship. OONI Probe tests the blocking of websites and apps and measures network speed and performance, while OONI Explorer displays censorship data collected from over 200 countries since 2012.
projectwallace.com
Project Wallace is a web-based CSS analyzer that examines stylesheets for complexity, specificity, performance and design tokens. Users paste a URL or raw CSS to receive a full analysis, a quality score, a design token audit and a custom property inspector, plus a cascade layer visualizer. Standalone tools include a CSS prettifier, minifier, diff viewer and specificity calculator.
github.com
📸 A powerful, high-performance React Native Camera library.
replay.io
Replay QA is an autonomous testing harness for web applications. Agents explore an app, write and run tests in a Chromium browser, and record deterministic runtime sessions. It reports bugs such as runtime bugs, UI glitches, accessibility issues, performance problems and security vulnerabilities, with a root cause and suggested fix. Reports go to GitHub, Linear, Jira or other HTTP endpoints.
speedvitals.com
SpeedVitals is a website speed testing tool that runs page speed tests from 30 or more locations and devices and measures Core Web Vitals. It also provides a TTFB test, batch analysis of up to 50 tests, performance monitoring with email and Slack alerts, and reports including waterfall charts and resource summaries. The site lists free tools such as an image compressor and an SEO analyzer.
specification.website
A platform-agnostic specification of the technical features a good website should have, built in the open under an MIT licence. It covers 177 topics across ten areas, including foundations, SEO, accessibility, security, performance and privacy, and offers a yes/no checklist for auditing a site. An open, read-only MCP server lets agents query the specification.
trippy.cli.rs
Trippy provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
waveform.com
Waveform Test provides network diagnostics for checking connectivity, traffic, devices, or internet performance.
zed.dev
Zed is a high-performance, multiplayer code editor created by the developers of Atom and Tree-sitter. Built from scratch in Rust to leverage multiple CPU cores and GPU resources, it is designed for speed, real-time collaboration with other users, and AI-assisted editing. The editor is available for macOS, Linux, and Windows.