JSPM

LazyLoad is a lightweight (2.4 kB) and flexible script that speeds up your web application by deferring the loading of your below-the-fold images, videos and iframes to when they will enter the viewport. It's written in plain "vanilla" JavaScript, it leve

sitespeed.io is an open-source tool for comprehensive web performance analysis, enabling you to test, monitor, and optimize your website’s speed using real browsers in various environments.

Throttle your connection

Core package for the Coach.

Xray your HAR file and know all about the page

LazyLoad is a lightweight (2.4 kB) and flexible script that speeds up your web application by deferring the loading of your below-the-fold images, videos and iframes to when they will enter the viewport. It's written in plain "vanilla" JavaScript, it leve

InfluxDB plugin for sitespeed.io

Lighthouse plugin for sitespeed.io

Analyze the web performance of your site

Command Line Tool for CrUX Rest API

Convert blurhash strings to CSS objects

WebPerf plugin for sitespeed.io

Analyze the web performance of your site using Gulp

Browser instrumentation helper that makes it easier to capture UX speed metrics

Analyze the web performance of your site using Grunt

The coach gives you advice on building a better web page

Unofficial Node.js client for the WebPageTest REST API

GPSI plugin for sitespeed.io

Browser instrumentation helper that makes it easier to capture UX speed metrics

Performance measurment plugin for gulp based on Phantomas

Convert your HAR file to a summary of a page

Analyze the web performance of your site

Analyze the web performance of your site

Easy performance improvements

PSI report

Analyze the web performance of your site

Create and compare web performance reports.

node-care client

A fast, lightweight script to load images as they enter the viewport. SEO friendly, it supports responsive images (both srcset + sizes and picture) and progressive JPEG

This is a fork of sitespeedio/coach. The coach gives you advice on building a better web page

For performant database-like operations on JavaScript

The coach gives you advice on building a better web page,this version's advice is in Chinese

A thin wrapper for the WebPageTest API that report specific metrics as csv/json or send them to Graphite/Statsv

Browser instrumentation helper that makes it easier to capture UX speed metrics