Uses PhantomJS to headlessly analyze web pages and generate manifests.
DebugBear is a site monitoring tool based on Lighthouse. See how your scores and metrics changed over time, with a focus on understanding what caused each change. DebugBear is a paid product with a free 30-day trial.
A Grunt.js task for enforcing a performance budget (more on performance budgets).
Grunt plugin for continuous measurement of WebPageTest. (Demo)
Grunt task for testing page performance using PhantomJS, a headless WebKit browser.
Webpage load time is extremely important for conversion and revenue. Visualize web performance against competitors.
Auditing and performance metrics tool for Progressive Web Applications.
The PageSpeed family of tools is designed to help you optimize the performance of your site. PageSpeed Insights products will help you identify performance best practices that can be applied to your site, and PageSpeed optimization tools can help you automate the process.
A web performance optimization and analysis tool.
AI-Based SEO Analysis & Monitoring Tool
Collect performance metrics for your library/application using Chrome headless.
Speedrank monitors the performance of your site in the background. It displays Lighthouse reports over time and delivers recommendations for improvement. Speedrank is a paid product with 14-day-trial.
Web Tracing Framework is a set of libraries, tools, and visualizers for the tracing and investigation of complex web applications
Get the web's modern capabilities on your own sites and apps with useful guidance and analysis from web.dev.
An extensible open-source load testing tool for advanced Linux users which is especially good as a part of an automated load testing suite.
Online quick and easy tool that audits frontend bad practices, reveals performance issues, and profiles JavaScript.
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high-performance web pages.
YSlow for PhantomJS also introduces new output formats for automated test frameworks: TAP (Test Anything Protocol) and JUnit.
A good website monitoring tool (bundling status page, incident notification)
End-to-end distributed tracing and APM at scale, correlated to all telemetry.
YSlow.js on Node.js is a simple Node.js wrapper for programmatically running phantomjs yslow.js.
A tool to get the uptime of your website (with probes from different locations)
PageSpeed Insights for Node.js - with reporting.
RoboMiri is a stable Uptime Monitor that offers a wide range of monitors: cronjob, keyword, website, port, ping. 25 uptime checks with 3 minutes interval checks for free. Alerts via Phone Call, SMS, Email, and WebHook.
Uptime, performance monitoring with debug details, and hosted status page in one simple dashboard.
Another uptime monitoring tool (with a generous free plan)
A robust benchmarking library that works on nearly all JavaScript platforms, supports high-resolution timers, and returns statistically significant results.
JSLitmus is a lightweight tool for creating ad-hoc JavaScript benchmark tests.
jsPerf aims to provide an easy way to create and share test cases, comparing the performance of different JavaScript snippets by running benchmarks. `Temporarily out, follow this issue for updates: https://github.com/jsperf/jsperf.com/issues/537`
Matcha allows you to design experiments that will measure the performance of your code. It is recommended that each bench focus on a specific point of impact in your application.
minimal monitor for JS Heap Size via performance memory.
Performance tests of JavaScript inheritance models.
This class provides a simple info box that will help you monitor your code performance.
Timing.js is a small set of helpers for working with the Navigation Timing API to identify where your application is spending its time. Useful as a standalone script, DevTools Snippet, or bookmarklet.
CSS Stress is a Testing and Performance Profiling.
A cross-platform, cross-browser bookmarklet that will analyze the DOM & other features of the page you're on, and give you its bill of health.
A bookmarklet to create a frontend performance heatmap of resources loaded in the browser using the Resource Timing API.
Analyze the current page through the Resource Timing API, Navigation Timing API and User-Timing - Sort of a light live WebPageTest. As Chrome Extension and Firefox Add-on under the name Performance-Analyser.
YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high-performance web pages.
Stoyan Stefanov
Lara Callender Hogan
Steve Souders
Ilya Grigorik
Nicholas C. Zakas
– Tom Barker
Steve Souders
Barry Pollard
Addy Osmani
– Barbara Bermes
Colin McKinnon
– Tammy Everts
Rick Viscomi, Andy Davies, Marcel Duran
Ben Farrell
Terrence Dorsey
Stoyan Stefanov
Jeremy L. Wagner
Patrick Killelea
Kyle Simpson
Helps you find the performance impact of adding an npm package to your frontend bundle.
Keep your bundle size in check.
Generate bundle report(bundle size, assets, modules, packages) and compare the results between different builds
Prepare compressed versions of assets to serve them with Content-Encoding.
Visualise the module tree of browserify project bundles and track down bloat.
analyze and Visualise project bundles created by Lasso.
Check your webpack bundle stats on every pull request, and track them over time.
Analyze and debug bundle space usage through source maps.
webpack plugin and CLI utility that represents bundle content as a convenient interactive zoomable treemap.
A content delivery network by Amazon that integrates nicely with other Amazon services or can be used standalone.
:cn: - Bootstrap Chinese net open CDN service (only HTTP).
An open-source CDN for JavaScript and CSS sponsored by CloudFlare that hosts everything from jQuery and Modernizr to Bootstrap.
A content delivery network that uses next-gen tech to deliver fast, reliable, CDN services
Google Hosted Libraries is a content distribution network for the most popular, open-source JavaScript libraries.
jQuery CDN – Latest Stable Versions, powered by MaxCDN.
Similar to Google Hosted Libraries, jsDelivr is an open-source CDN that allows developers to host their own projects and anyone to link to our hosted files on their sites.
A state-of-the-art opensource CDN with aggressive content optimization using brotli-11 compression, HTTP/2 server push, better HTTP/2 multiplexing, and more. Supports 100s of libraries and 2000+ WordPress themes already. Easy to use, easy to link, and very fast.
:cn: - CDN provided by upyun.
:ru: - Yandex Content Delivery Network hosts popular third-party JavaScript and CSS libraries (best for use in Russia).
The list includes 35 best practices divided into 7 categories, created by Yahoo! Exceptional Performance team.
A collaborative guide about frontend performance.
A guide created by PageSpeed Team.
– #PerfMatters Conference is the ONLINE web performance conference by internationally renowned performance developers.
– The performance.now() conference will return to Amsterdam! We're a single-track conference with fourteen world-class speakers, covering today’s most important web performance insights.
– A free, online, single-track conference focused on helping everyone succeed with Progressive Web Apps.
– At Velocity, web operations, performance, and DevOps professionals learn to build fast, resilient, and highly available sites and apps.
– We Love Speed was born from the desire to share knowledge and experiences in web performance as widely as possible.
Assetgraph transform for auto-generating sprites based on the CSS dependency graph.
JavaScript code generation tool that lets you write JavaScript that outputs JavaScript. Good for unrolling loops and writing libraries that compile away the runtime
CSS sprites allow you to combine multiple images into a single file.
Glue is a simple command-line tool to generate sprites:
Grunt task that generates a sprite from images referenced in a style sheet and then updates the references with the new sprite image and positions.
Grunt task for converting a set of images into a sprite sheet and corresponding CSS variables.
SVG sprites & stacks galore — Grunt plugin wrapping around svg-sprite that reads in a bunch of SVG files, optimizes them and creates SVG sprites and CSS resources in various flavors.
gulp task for creating an image sprite and the corresponding style sheets for Gulp.
gulp task for creating SVG sprites.
Spriter is a simple and flexible dynamic sprite generator for CSS, using Python. It can process CSS both synchronous and asynchronous as it provides classes to be used in your Python code and also a watcher that listens to your filesystem and changes CSS and sprite as soon as a static is changed.
Sprite Cow helps you get the background-position, width, and height of sprites within a spritesheet as a nice bit of copyable CSS.
The sprite factory is a ruby library that can be used to generate CSS sprites. It combines individual image files from a directory into a single unified sprite image and creates an appropriate CSS style sheet for use in your web application.
A modular image sprite generator with a lot of features: supports retina sprites, supports different output formats, generates sprites and proper style files out of a directory of images, etc...
Optimizes and renders SVG files in CSS / Sass sprites.
ZeroSprites is a CSS sprites generator aimed at area minimization using algorithms used in the field of VLSI floorplanning.
Recompress PNG files to get the smallest possible size.
Online image compressor for JPG, PNG, SVG and GIF.
Pure elixir library to extract tiff and exif metadata from JPEG files.
GUI app to remove EXIF metadata from images and video files with drag and drop. Free and open source.
GraphicsMagick and ImageMagick for Node.js.
Minify PNG and JPEG images for Grunt.
Make ImageOptim, ImageAlpha, and JPEGmini part of your automated build process.
Grunt plugin to remove unnecessary bytes of PNG and JPG using Yahoo Smushit.
Convert your images to WebP format.
Minify PNG, JPEG, GIF and SVG images with imagemin for Gulp.
Gulp plugin to optimize PNG and JPG using Yahoo Smushit. Made on top of smosh.
Convert images to WebP for Gulp.
Cloud service for optimizing, resizing and caching images on the fly with great mobile support.
Intelligent real-time image optimizations, image transformations with a global delivery network and storage.
Minify images seamlessly with Node.js.
Free app that makes images take up less disk space and load faster, without sacrificing quality. It optimizes compression parameters, and removes junk metadata and unnecessary color profiles.
Automates ImageOptim, ImageAlpha, and JPEGmini for Mac to make batch optimization of images part of your automated build process.
Utility to optimize/compress JPEG files.
Optimize your images and will be available for download for 12 hours.
Lightweight lossless file minifier/optimizer.
Improved JPEG encoder.
CLI image optimization tool. It can compress PNG, JPEG, GIF and SVG lossy and lossless, and also create AVIF and WebP versions for raster images.
OptiPNG is a PNG optimizer that recompresses image files to a smaller size, without losing any information.
Generate optimized images (WebP, AVIF) and LQIP placeholders using Vite or webpack plugins and render responsive image markup with an image component for multiple frameworks.
The typical use case for this high-speed Node.js module is to convert large images of many formats to smaller, web-friendly JPEG, PNG, and WebP images of varying dimensions.
Compress Your Image by removing unnecessary bytes of the image and Convert it into WebP/AVIF
One-click optimization for images in your GitHub repos
Smush it uses optimization techniques specific to image format to remove unnecessary bytes from image files. It is a "lossless" tool, which means it optimizes the images without changing their look or visual quality.
Tapnesh is a CLI tool that will optimize all your images in parallel easily and efficiently!
Advanced lossy compression for PNG images that preserves full alpha transparency.
A cross-platform tool for losslessly optimizing PNG and JPG files.
A command-line program to optimize PNG images.
Async Everything: Make the meat of your pages load faster with this JS morsel.
The only script in your HEAD. for Responsive Design, Feature Detections, and Resource Loading.
InstantClick makes the following links in your site instant.
A JIT (Just In Time) plugin loader for Grunt. The load time of Grunt does not slow down even if there are many plugins.
is an open-source (MIT license) project supported by Getify Solutions. The core purpose of LABjs is to be an all-purpose, on-demand JavaScript loader, capable of loading any JavaScript resource, from any location, into any page, at any time.
RequireJS is a JavaScript file and module loader. It is optimized for in-browser use, but it can be used in other JavaScript environments, like Rhino and Node.js.
Using Phantomas (a PhantomJS-backed client performance metrics scrapper). Benchmark a page, store results in MongoDB, and display results via the built-in server.
Continually checks web page load times in Internet Explorer, Chrome and Firefox from multiple points around the world.
Full featured Real User Monitoring solution. Free tier for smaller sites. Includes monitoring for Google's Core Web Vitals.
Real Browser Monitoring. Offers complete reports about web performance and quality using YSlow, Page Speed and numerous custom tips.
analyze your website's speed in real browsers from 20 locations worldwide.
Grunt plugin wrapping phantomas to measure frontend performance.
GTmetrix uses Google Page Speed and Yahoo! YSlow to grade your site's performance and provides actionable recommendations to fix these issues.
Tool to monitor indicators related to the performance of a web page.
Monitor your browser-side applications in real time, with a focus on real end users’ experiences.
Runtime Browser Performance regression suite (Demo).
PhantomJS-based web performance metrics collector and monitoring tool.
Free site and SSL Monitoring with response time alerting (on Slack, Twitter, Mattermost, Discord or custom Webhook).
Test the load time of that page, analyze it, and find bottlenecks.
open source tool that helps monitor various site performance metrics over time. It captures the results of YSlow, Page Speed Insights, WebPageTest and dynaTrace Ajax Edition.
Sitespeed.io is an open-source tool that will check your site against web performance best practice rules and use the Navigation Timing API to collect metrics. It will create XML & HTML output of the result.
Run a free site speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds. You can run simple tests or perform advanced testing including multi-step transactions, video capture, content blocking and much more. Your results will provide rich diagnostic information including resource-loading waterfall charts, Page Speed optimization checks and suggestions for improvements.
django-html in an HTML minifier for Python with full support for HTML 5. It supports Django, Flask and any other Python web framework. It also provides a command-line tool that can be used for static sites or deployment scripts.
A grunt plugin to minify HTML that uses HTMLMinifier.
Grunt plugin for HTML compression, using htmlcompressor.
A gulp plugin to minify HTML that uses HTMLMinifier.
A HTML min tool by kangax (HTMLMinifier Creator).
A simple Windows command-line tool to minify your HTML, Razor views & Web Forms views
HtmlCompressor is a small, fast, and very easy to use Java library that minifies given HTML or XML source by removing extra whitespaces, comments, and other unneeded characters without breaking the content structure. As a result page become smaller in size and load faster. A command-line version of the compressor is also available.
HTMLMinifier is a highly configurable, well-tested, Javascript-based HTML minifier, with lint-like capabilities.
Ruby wrapper for kangax html-minifier.
Ruby gem for compressing html, that removes all whitespace junk, and leaves only HTML.
Middleware that minifies your HTML responses using html-minifier. It uses html-minifier's default options which are all turned off by default, so you have to set the options otherwise it's not going to do anything.
Minimize is an HTML minifier based on the node-htmlparser,currently, HTML minifier is only usable server-side. Client-side minification will be added in a future release.
A fast, efficient, and well-tested CSS minifier for node.js.
cssmin.js is a JavaScript port of YUICompressor's CSS minifier.
CSS minimizer unlike others. In addition to usual minification techniques, it can perform structural optimization of CSS files, resulting in smaller file size compared to other minifiers.
Because CSS is ospon the critical path to rendering pages. It must be small! Or else!
Compresses linked and inline JavaScript or CSS into a single cached file.
Pipeline is an asset packaging library for Django, providing both CSS and JavaScript concatenation and compression, built-in JavaScript template support, and optional data-URI image and font embedding.
A Grunt plugin to concatenate files.
CSS Minifier for Grunt.
A Grunt plugin to concatenate and minify JavaScript files.
This is just a grunt wrapper for CSS Shrink.
A grunt task for removing unused CSS from your projects.
Shrinks CSS files using cssshrink for Gulp.
A gulp task for removing unused CSS from your projects.
The most minimalistic online JS Compress tool.
JShrink is a PHP class that minifies JavaScript so that it can be delivered to the client quicker.
Uglify (strip spaces) or prettify (add consistent spaces) CSS code.
UglifyJS is a JavaScript parser, minifier, compressor or beautifier toolkit, written in JavaScript.
JavaScript compressor which, in addition to removing comments and white-spaces, obfuscates local variables using the smallest possible variable name. This obfuscation is safe, even when using constructs such as 'eval' or 'with' (although the compression is not optimal is those cases) Compared to jsmin, the average savings is around 20%.
Extract & Inline Critical-path CSS in HTML pages (alpha).
Utility that minifies CSS colors, example: min("white"); // minifies to "#fff".
A no-dependencies HTTP client library for browsers and Node.js with a promise-based or Node.js-style callback-based API to progress events, text, and binary file upload and download, partial response body, request and response headers, status code.
High-performance lazy loader for images (responsive and normal), iframes, and scripts, that detects any visibility changes triggered through user interaction, CSS or JavaScript without configuration.
Perf Tooling is a shared resource to keep track of new and existing performance tools.
Socialite provides a very easy way to implement and activate a plethora of social sharing buttons — any time you wish. On document load, on article hover, on any event.
TMI (Too Many Images) - discover your image weight on the web.
uCSS is made for crawling (large) sites to find unused CSS selectors, but not remove unused CSS.
Minify SVG using SVGO for Grunt.
Minify SVG with SVGO for Gulp.
Scour is an open-source Python script that aggressively cleans SVG files, removing a lot of 'cruft' that certain tools or authors embed into their documents.
SVG Cleaner could help you to clean up your SVG files from unnecessary data. It has a lot of options for cleanup and optimization, works in batch mode, and provides threaded processing on multicore processors.
SVGOMG is SVGO's Missing GUI, aiming to expose the majority, if not all the configuration options of SVGO.
SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.
Open source load testing tool: It is a Java platform application.
Autoperf is a ruby driver for httperf, designed to help you automate load and performance testing of any web application - for a single endpoint, or through log replay.
A utility for arming (creating) many bees (micro EC2 instances) to attack (load test) targets (web applications).
Go Port of HTTPerf.rb.
httperf is a tool for measuring web server performance. It provides a flexible facility for generating various HTTP workloads and for measuring server performance.
JS Port of HTTPerf.rb.
Python Port of HTTPerf.rb.
Simple Ruby interface for httperf, written in Ruby.
An open-source load testing tool built for developers. Easy to integrate into CI pipelines. Tests are written in ES6 JS and you can test APIs, microservices and sites using HTTP/1.1, HTTP/2 and WebSocket.
An open-source load testing tool. Define user behaviour with Python code, and swarm your system with millions of simultaneous users.
PHP Port of HTTPerf.rb.
A HTTP benchmarking tool (with optional Lua scripting for request generation, response
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This specification defines the `will-change` CSS property which allows an author to declare ahead-of-time what properties are likely to change in the future, so the UA can set up the appropriate optimizations some time before they’re needed. This way, when the actual change happens, the page updates in a snappy manner.
It's a permanent repository of web performance information such as size of pages, failed requests, and technologies utilized. This performance information allows us to see trends in how the Web is built and provides a common data set from which to conduct web performance research.
A curated list of webpack tools for web performance
Research in Web Performance
This specification defines a unified interface to store and retrieve high resolution performance metric data related to the navigation of a document.
This specification defines a means for site developers to programmatically determine the current visibility state of the page in order to develop power and CPU-efficient web applications.
PageSpeed speeds up your site and reduces page load time. This open-source web server module automatically applies web performance best practices to pages and associated assets (CSS, JavaScript, images) without requiring that you modify your existing content or workflow. PageSpeed is available as a module for Apache 2.x and Nginx 1.x.
This specification defines a unified interface to store and retrieve performance metric data. This specification does not cover individual performance metric interfaces.
This specification defines the dns-prefetch, preconnect, prefetch, and prerender relationships of the HTML Link Element (<link>). These primitives enable the developer, and the server generating or delivering the resources, to assist the user agent in the decision process of which origins it should connect to, and which resources it should fetch and preprocess to improve page performance.
This specification defines an interface for web applications to access the complete timing information for resources in a document.
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This specification defines an interface to help web developers measure the performance of their applications by giving them access to high-precision timestamps.
The mission of the Web Performance Working Group, part of the Rich Web Client Activity, is to provide methods to measure aspects of application performance of user agent features and APIs.
WebP with Accept negotiation.