Context-aware web performance for everyone

Lightweight JavaScript library that predicts user intent based on mouse movements and keyboard navigation. Perfect for smart prefetching. Also works for mobile!

hack into react internals

A library to inline your app's critical CSS and lazy-load the rest.

Scan and fix React performance issues

Performance testing companion for React and React Native

A framework for finding JavaScript memory leaks and analyzing heap snapshots

A simple, tiny and lightweight benchmarking library!

A fast, interactive web-based viewer for performance profiles.

Calculate the real cost to run your JS app or lib to keep good performance. Show error in pull request if the cost exceeds the limit.

Essential metrics for a healthy site.

GPU Accelerated JavaScript

SVG Optimizer for Node.js and CLI.

Automated auditing, performance metrics, and best practices for the web.

Extract & Inline Critical-path CSS in HTML pages