Node plugins

Automated tool for improving the quality of your progressive web apps. Run as a Chrome Extension, from the CLI, or used programmatically as a Node module.

Big Rig is an experimental, proof-of-concept system for generating and parsing Chrome's trace files. It has a web app dashboard that will allow you to track performance statistics over time, as well a...

A modular minifier, built on top of PostCSS. Does more than simple whitespace transforms: custom identifier reduction, z-index rebasing, adjacent selector merging and more.

Find your way through the performance optimization maze in this NodeSchool workshopper

The fastest Node.js module for resizing JPEG, PNG, WebP and TIFF images. Uses the libvips library.

Gather important web performance data. It runs five times providing a good view on understanding how a web page is loaded. It has been rewritten to pull the latest Navigation Timing API data from Phan...

Discover the percent of unused JS on a page with this simple browser proxy. There are already several tools that tell you the percent of unused CSS on a webpage. But what about unused JS? Well this to...

Performance testing tool for Responsive web designs.

Concatenate a set of Web Components into one file.

Bindings for Zopfli compressing lib. Compress gzip files 5% better than gzip.

Critical extracts & inlines critical-path (above-the-fold) CSS from HTML.

PerfJankie is a tool to monitor smoothness and responsiveness of websites and Cordova/Hybrid apps over time. It runs performance tests using browser-perf and saves the results in a CouchDB server. It ...

Sitespeed.io is an open source tool that helps you analyze your website speed and performance based on performance best practices and metrics.

Because CSS is on the critical path to rendering pages. It must be small! Or else!

Convert images to WebP

A CSS redundancy analyzer that analyzes redundancy. csscss will parse any CSS files you give it and let you know which rulesets have duplicated declarations.

A tool for measuring browser performance metrics (like frame rates, expensive layouts, paints, styles, etc.). For Web pages, Cordova/Phonegap and other Hybrid applications. Metrics are measured while ...

Keep a watchful eye on your css colors.

Automates ImageOptim, ImageAlpha, and JPEGmini for Mac to make batch optimisation of images part of your automated build process.

SVGO is a Nodejs-based tool for optimizing SVG vector graphics files.

Discover your image weight on the web. Find out the image weight in your pages, compare to the HTTPArchive average and discover what images you can optimize further.

Parker is a stylesheet analysis tool. It runs metrics on your stylesheets and will report on their complexity.

PhantomJS-based web performance metrics collector and monitoring tool.

StyleStats is a Node.js library to collect CSS statistics.

Minify images seamlessly

A fast, efficient, and well tested CSS minifier for node.js.

HTMLMinifier is a highly configurable, well-tested, Javascript-based HTML minifier, with lint-like capabilities.