JSPM

Automatic font fallback based on font metrics

Get unique values of an array. Really, like deeply unique.

Cloud-scale load testing. https://www.artillery.io

Size Limit preset for small open source libraries

Fast heap-based priority queue in JavaScript

Measure React Native performance

esbuild plugin for Size Limit

Functional CSS for humans

check if the event loop is blocked

Get the global cache directory

Calibre - Page speed performance testing with Google Lighthouse

Bind data arrays to any type of JS objects

the fastest version of Function#bind I could make

Downloading and running time plugin for Size Limit

Webpack plugin for Size Limit

Evaluates how long the browser will execute your javascript code

Run grunt tasks concurrently

A performant, customizable React Native signature canvas with advanced error handling, WebView optimization, and TypeScript support for iOS, Android, and Expo

benchmark tooling that loves you ❤️

Small timing library

Clinic.js diagnoses your performance issues

React hook to measure an element's size and handle responsive components.

simple high resolution timing

A storybook addon to help better understand and debug performance for React components

The simplest and lightweight solution for User Timing API in Javascript.

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

Core performance client

WebdriverIO service for analyzing test flow performance

Generate HAR file with Puppeteer

webpack speed booster, makes you happy!

Universal bundle analyzer and visualizer that works with most popular bundlers and frameworks.

Easily monitor your ThreeJS performances.

Send WebVitals from your Next.js project to Axiom.

A virtual DOM library with focus on simplicity, modularity, powerful features and performance.

The core Node library used to integrate with Codspeed runners

Speed up eslint to accelerate your development workflow

A fast Mersenne Twister

React hook to monitor an element enters or leaves the viewport (or another element).

A function, a component and a mixin for React pure rendering

A JavaScript library for measuring the First Input Delay metric. See https://goo.gl/1AKcj5.

A bluebird wrapper for node-mysql

Relocate resource intensive third-party scripts off of the main thread and into a web worker.

Generate critical path CSS for web pages

**Fully** Reactive Component Template Rendering in Angular. @rx-angular/template aims to be a reflection of Angular's built in renderings just reactive.

A light-weight JS library to lazy load any HTML element such as images, ads, videos etc.

User Timing polyfill

Performance Profiler and Monitor

Size Limit preset for applications

Perform data joins with any type of JS objects

vitest plugin for CodSpeed

Get the speed index from chrome dev tool timeline files. The CLI

@rx-angular/cdk is a Component Development Kit for ergonomic and highly performant angular applications. It helps to to build Large scale applications, UI libs, state management, rendering systems and much more. Furthermore the unique way of mixing reacti

Full featured Promises/A+ implementation with exceptionally good performance

Use Partytown to move scripts into a web worker in your Astro project

Internal metrics plug-in package for Node.js monitoring with Instana

A React Higher Order component that wraps your React Components and debounces their rendering. Uses lodash.debounce under the hood.

Signals for managing, caching and syncing asynchronous and remote data in Angular

ultility to measure execution time

JSON parser and stringifier for custom numbers (e.g. BigInt)

Parse performance test results from JMeter and many more

Core library for Instana's Node.js packages

Improve your Nuxt.js Google Lighthouse score by delaying hydration ⚡️

infinite-scroll, done right. done.

Size Limit preset for big open source libraries

Mixins that manage rendered CSS from modular importing

measure startup time of your react-native app

A performant virtual scrolling list library

Run load tests for your web application. Mostly ab-compatible interface, with an option to force requests per second. Includes an API for automated load testing.

Optimize the speed of important tasks on limited ressources

Stylelint rule for preventing the use of low performance animation and transition properties.

Same as React's `useCallback`, but returns a stable reference.

Customize scrollbar in modern browsers with smooth scrolling experience.

Smooth page transitions, smart preloading and more in Astro

A JavaScript library for zooming images like Medium

Web performance library for measuring all User-centric performance metrics, including the latest Web Vitals.

javascript implementation of the event-reduce algorithm https://pubkey.github.io/event-reduce/

Harness the power of Intersection Observers for simple list virtualization in React

redux store enhancer which allows batching subscribe notifications.

Better Stack Telemetry Next.js client

A d3.js library to produce flame graphs.

requestAnimationFrame pool to avoid busyness on the thread

The linting tool for the web

Like Underscore, but lazier

A simple, light-weight NodeJS utility for measuring code execution in high-resolution real times.

request animation frame

Compress 🗜️

General Language Independent Driver for the Enterprise (GLIDE) for Valkey

webhint's recommended hints configuration for live websites

High performance Node.js webserver with a simple-to-use API powered by uWebsockets.js under the hood.

High-performance streaming multipart/mixed parser for Node.js

Collection of utilities for InfernoJS

Faster subsequent page-loads by prefetching in-viewport links during idle time

Generate performance statistics for async or sync functions

[![npm version][npm-version-src]][npm-version-href] [![npm downloads][npm-downloads-src]][npm-downloads-href] [![Github Actions][github-actions-src]][github-actions-href] [![Codecov][codecov-src]][codecov-href]

This module can add `ServerTiming` Header to http response, and be able to use express middleware

request animation frame

Breakpoints mixin pack for Seed

Run gulp tasks in separate cpu processes

Patches global.Promise to use bluebird and returns a bluebird instance

An extremely fast JSX, HTML and XML parser written in Rust compiled to WebAssembly for Node and the Web

Playwright plugin for analyzing test flow performance

A dead simple benchmarking framework

This plugin gives you the ability to use the Dynatrace Mobile agent in your react native application.

esbuild plugin for Size Limit

Implement live chat in your react app without taking a performance hit.

Fast and lightweight, standard-compliant javascript parser written in ECMAScript

Webpack Statoscope plugin for Size Limit

Native bindings for valkey-glide on linux-x64-gnu

@rx-angular/state is a light-weight, flexible, strongly typed and tested tool dedicated to reduce the complexity of managing component state and side effects in angular

划时代的字体切割工具，CJK与任何字符！支持 otf、ttf、woff2 字体多线程切割，完美地细颗粒度地进行包大小控制。A revolutionary font subetter that supports CJK and any characters! It enables multi-threaded subset of otf, ttf, and woff2 fonts, allowing for precise control over package size.

Min Heap

Fast and small Node.js Worker_Threads and Cluster Worker Pool

An automatic Web Font optimization plugin that supports many platforms such as Vite, Next, Nuxt, and more.

Inspect module load time with performance.measure

Compress 🗜️

Lazily render react components

Benchmark.js compatibility layer for CodSpeed

High performance debug logging

Scan your entire website with Google Lighthouse.

NextJS version of Webpack Bundle Analyzer.

Fast way to send synchronous web requests in NodeJS. API is a subset of sync-request. Leverages node-libcurl for high performance. Cannot be used in a browser.

Critical CSS for Nuxt

Node.js SDK for Dynatrace OneAgent

Angular library which drastically improves execution time of your component's unit tests

Native bindings for valkey-glide on linux-x64-musl

Select virtualized component using: react-select v4 + react-virtualized + react hooks

A gzip, brotli and zstd compressor for Astro

A 100% compliant, self-hosted typescript parser that emits an ESTree-compatible abstract syntax tree

Comprehensive library for monitoring system statistics including CPU, memory, disk, network, battery, and process information with time-series monitoring

A thin wrapper around fetch that prevents duplicate requests.

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![License][license-image]][license-url] [![Downloads][downloads-image]][downloads-url]

console.time, console.timeLog and console.timeEnd polyfill for react-native

A tiny React hook for rendering large datasets like a breeze.

memoize the last result, in async way

This is a library for optimizing performance sensitive events and declarative preventDefault and stopPropagation

Blazing fast flame graphs for V8 and Node

A Vite plugin for React Scan - detects performance issues in your React app.

Delightfully scan your entire website with Google Lighthouse. Navigate your performance, accessibility and SEO.

A simple API for accessing v8 native instructions

A Svelte action that monitors an element enters or leaves the viewport or a parent element. Performant and efficient thanks to using Intersection Observer under the hood.

Functional CSS for humans

Use Alpine within Astro

A fast lightweight pure JavaScript script for lazy loading and multi-serving images, iframes, videos and more.

ObserveRTC Client Integration Javascript Library

<h1 align="center" style="border-bottom: none;">🔎 PerformanceObserver Polyfill</h1> <p align="center"> <a href="https://travis-ci.org/fastly/performance-observer-polyfill"> <img alt="Travis" src="https://img.shields.io/travis/fastly/performance-obs

Monitor your web app's performance

An Astro integration to optimize Local & Google fonts inspired by @next/font

Enable other React components to be selectable by drawing a box with your mouse/touch

React component for visualizing profiling data

A developer tool for debugging React performance issues caused by hook changes and component re-renders.

Very simple module to calculate block execution time.

The hapi utility toy chest

Webpack plugin to inline critical CSS and lazy-load the rest.

react StaticContainer

Record PerformanceEntry objects from Node.js and the Web in the Trace Event Format, so that it can be visualized on https://ui.perfetto.dev.

The modular and type-safe form library for Qwik

This is a library for optimizing performance sensitive events and declarative preventDefault and stopPropagation

WebPageTest API wrapper for NodeJS

Fast and consistently responsive apps using a single function call

Measure Babel compilation time

Border theme pack for Seed

Lazy loading for express router

Cutting edge GraphQL planning and execution engine

📈 Beautiful, high-performance Graphs and Charts for React Native

Props mixin pack for Seed

Memoz is an in-memory database that persists on disk. The data model is key-value.

JustGage is a handy JavaScript plugin for generating and animating nice & clean gauges. It is based on Raphaël library for vector drawing, so it’s completely resolution independent and self-adjusting.

Walk the primary nodes of an esprima parse tree - fast.

Parse raw trace data into the Chrome DevTools' structured profiling data models

Conversational ServiceNow development platform using Claude Code. Multi-agent orchestration with 20+ MCP servers providing 200+ ServiceNow tools for comprehensive platform development.

Get time passed since node.js app start. Similar to performance.now() from browsers.

Fast cartesian product

statman-stopwatch is one of the metrics from the statman library. It is a simple high res stopwatch for node.js. Stopwatch is useful for determining the amount of time it takes to perform an activity.

The modular and type-safe form library for SolidJS

the fastest function for deep clone js objects compatible with es6

Native bindings for valkey-glide on linux-arm64-musl

Better image downscale with canvas.

A CLI to run all kinds of code quality measurements to align your team with company goals

Speed-optimized BitSet implementation for modern browsers and JavaScript engines, using typed arrays

A performant binary encoding for geographic data

Agent for AppOptics APM

Express middleware providing on-demand caching in high traffic situations.

A custom Jest reporter that identifies and reports on the slowest running tests in your test suite.

Nuxt.js module to automatically make your webpack builds faster and smaller.

A Cypress plugin for reporting individual command timings

A simple requestAnimationFrame wrapper with added iteratee creator.

An opentracing implementation for zipkin

Constant for better performance

Native bindings for valkey-glide on linux-arm64-gnu

Core business logic for the used by the Code PushUp CLI

Skeleton elements (aka UI Skeletons, Skeleton Screens, Ghost Elements) - UI for improved perceived performance

Performant react hooks for WebApi Observers, useResizeObserver, useInteractionObserver, useMutationObserver

A lightweight utility for ES6 like classes and an easier ES5 aware object properties definition introducing new, performance oriented, patterns.

Easily monitor your vanilla ThreeJS app performances.

A short and quick way to assess performance on a server.

A Fast & Light Virtual DOM Alternative

Make your site’s pages instant in 1 minute and improve your conversion rate by 1%

An in-memory caching (memoization) decorator for Typescript

Code PushUp plugin for detecting problems in source code using ESLint.📋

Caches resolved paths in module require to avoid Node hunting for right module. Speeds up app load.

Native bindings for valkey-glide on darwin-arm64

A WebdriverIO service that allows you to run Chrome DevTools commands in your tests

Simple module to time your code JavaScript or TypeScript code, to see how long it took to run.

Inline 🦔

Web Vitals for Nuxt.js

* [About the Project](#about-the-project) * [Getting Started](#getting-started) * [Installation](#installation) * [TypeScript](#typescript) * [Usage](#usage) * [Component](#component) * [Props](#props) * [Hook](#hook) * [Roadmap](#roadmap) * [Contributing

Stateless weak memoization replacement for reselect and memoize-one

Performance focused, lightweight scroll animation library

A modern benchmarking library for Node.js

Check load performance of your module and its dependencies

Lazy is a fast, feature-rich and lightweight delayed content loading plugin for jQuery and Zepto. It's designed to speed up page loading times and decrease traffic to your users by only loading the content in view.

Give users a great experience best suited to their device and network constraints

A Redux store enhancer which uses User Timing API to profile redux actions and time spent on notifying store listeners

Neo.mjs: The multi-threaded UI framework for building ultra-fast, desktop-like web applications with uncompromised responsiveness, inherent security, and a transpilation-free dev mode.

Timings for HTTP requests. This is a fork of @szmarczak/http-timer, but with CommonJS support.

Convert LI-HAR to k6 script

Benchmark runner for NodeJS

LightWeight, dependency free, javascript object cleaning library

automatic redis pipeline

Webpack plugin to support css for Size Limit

Native bindings for valkey-glide on darwin-x64

A SVG-based LQIP image placeholder generator

High-performance, virtualized list for React Native. Efficiently renders large datasets with recycler API for smooth scrolling and low memory usage. Ideal for fast, scalable, customizable lists on Android, iOS, and web.

Package to assist with collection of metrics, including stopwatch functionality

Return a high-resolution time.

Ultra-fast MessagePack implementation with extensions for records and structured cloning

Automatic performance and profiling instrumentation for your jest tests.

React implementation of smooth-scrollbar

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.

Dash0's Web SDK to collect telemetry from end-users' web browsers

A versatile and captivating React Native component that empowers developers to seamlessly integrate Instagram-style stories into their mobile applications, fostering an engaging and interactive user experience.

🚀 Boost your React Native app's performance with a single line of code

[![github actions][actions-image]][actions-url] [![coverage][codecov-image]][codecov-url] [![dependency status][deps-svg]][deps-url] [![dev dependency status][dev-deps-svg]][dev-deps-url] [![License][license-image]][license-url] [![Downloads][downloads-im

Production-ready HTTP client for bulk operations with connection pooling, exponential backoff, streaming, and comprehensive error handling

A collection of standard data-structures for node and browser

React hook for highly-performant and manipulable animations using Web Animations API.

A collection of scripts to send Core Web Vital data to GA4

Automatically sort your head with capo.js in Astro

Return a high-resolution time difference.

Benchmark harness.

⏱ Collect and measure browser performance metrics

React window hooks

Painless universal prerendering for Webpack. Works great with html-webpack-plugin.

Day.js with all plugins and locales added out of the box, no need to use dayjs.extend nor dayjs.locale!

NodeJS performance benchmark

Internal utility package for serverless Node.js tracing and monitoring with Instana

Config utility pack for Seed

Xray your HAR file and know all about the page

Button component pack for Seed

Next.js redis cache handler