JSPM

Fast JavaScript array sorting by implementing Python's Timsort algorithm

Module that helps you write generated functions in Node

Performance timer based on performance.mark() and measure()

High-performance MCP server for Keepa API with advanced caching, rate limiting, and optimization features

Convert the result of `process.hrtime.bigint()` to seconds, milliseconds, nanoseconds

Firebase JavaScript library for web and Node.js

Full featured Promises/A+ implementation with exceptionally good performance

Simple, efficient, scalable, high-performance LMDB interface

Enterprise-grade TypeScript error handling with ALL limitations fixed in v5.0.0: memory management, performance optimization, enhanced cleanup, JSON serialization, concurrency protection, simplified APIs, and linter-friendly async functions. Zero dependen

A scheduler based on requestAnimationFrame

Extremely fast implementation of node core url library

TimSort: Fast Sorting for Node.js

Simplified high resolution timing

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

Zero cost events

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

A comprehensive Model Context Protocol (MCP) server optimized for the Bun JavaScript runtime with advanced execution and optimization tools.

Inline critical CSS and lazy-load the rest.

Extremely fast implementation of node core url library

Get the speed index from chrome dev tool timeline files

TypeScript port of HdrHistogram

A small script that provides build sizes to assist with optimization

A high-performance, lightweight LRU cache. Built for developers who need fast caching without compromising on features.

New Relic agent

Memoize promise-returning & async functions

Performance Profiler and Monitor

Manage multiple event handlers using few event listeners

A declarative JavaScript library for building user interfaces.

A BVH implementation to speed up raycasting against three.js meshes.

The listview that you need and deserve. It was built for performance, uses cell recycling to achieve smooth scrolling.

The fastest smallest Javascript polyfill for the encode of TextEncoder and decode of TextDecoder for UTF-8 only. Made by AnonyCo with ❤️ from 🐕s.

JavaScript Performance Monitor

A well tested, feature rich Firebase implementation for React Native, supporting iOS & Android. Individual module support for Admob, Analytics, Auth, Crash Reporting, Cloud Firestore, Database, Dynamic Links, Functions, Messaging (FCM), Remote Config, Sto

A module to create a set of unique numbers as fast as possible.

FlashList is a more performant FlatList replacement

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

Monkey patches React to notify you about avoidable re-renders.

A way to leverage Vercel's Image Optimization API in Astro

A tiny, crazy fast memoization library for the 95% use-case

A benchmarking library that supports high-resolution timers & returns statistically significant results.

CLI tool for Size Limit

A comprehensive Angular performance analyzer that identifies performance bottlenecks, memory leaks, and optimization opportunities in Angular applications

Scan your React app for renders

Enterprise-grade TypeScript REST API management library for React and React Native with advanced caching, state management, and performance optimization

A tiny, faster alternative to native Array.prototype.every

The official Elastic APM agent for Node.js

File size plugin for Size Limit

A React component for creating interactive holographic trading card effects with dynamic color shifting, mouse tracking, spring animations, cursor-following glow, shimmer effects, and performance optimization

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

Critical CSS for Nuxt

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

Blazing fast memoization based on all parameters passed

Get the quickest, most high-resolution timestamp possible in node or the browser

High-performance optimization tools for Three.js including texture atlas management, asset loading, and memory optimization

Modern TypeScript JSON diff library - Zero dependencies, high performance, ESM + CommonJS support. Calculate and apply differences between JSON objects with advanced features like key-based array diffing, JSONPath support, and atomic changesets.

A triple-linked lists based DOM implementation

🔍 A robust, production-ready React/TypeScript library for viewing Bitcoin Ordinals inscriptions with advanced optimization features including LRU caching, LaserEyes wallet integration, virtual scrolling, and performance monitoring

Ultra-fast and conformant CBOR (RFC 8949) implementation with support for numerous tag extensions including records and structured cloning

Set of the fastest tools for optimizing the work of a React application

A lite module for reverse-operations on buffers

A simple node module to access V8 inspector + some tools to export and read the data.

High performance (jankfree) lazy loader for images (including responsive images), iframes and scripts (widgets).

Automatic <head> 🤖 optimization with CapoJS for Astro 🚀

An extremely fast, React-like JavaScript library for building modern user interfaces

High-res timestamps in Node and browser

A JavaScript library for zooming images like Medium

Zero-runtime styled components for SolidJS with Lightning CSS optimization and spring animations. Production-ready CSS-in-JS with 100% test coverage.

ESLint plugin for React Signals hooks - enforces best practices, performance optimizations, and integration patterns for @preact/signals-react usage in React projects

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

Automatic font fallback based on font metrics

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

check if the event loop is blocked

Get the global cache directory

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

Functional CSS for humans

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

Run grunt tasks concurrently

Webpack plugin for Size Limit

benchmark tooling that loves you ❤️

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

Evaluates how long the browser will execute your javascript code

Small timing library

Clinic.js diagnoses your performance issues

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

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

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

simple high resolution timing

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

Core performance client

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

WebdriverIO service for analyzing test flow performance

Generate HAR file with Puppeteer

Easily monitor your ThreeJS performances.

Send WebVitals from your Next.js project to Axiom.

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

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

The core Node library used to integrate with Codspeed runners

webpack speed booster, makes you happy!

Command-line interface for tw-enigma CSS optimization

A fast Mersenne Twister

A bluebird wrapper for node-mysql

Speed up eslint to accelerate your development workflow

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

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

Generate critical path CSS for web pages

Intelligent performance optimization engine - Automated bottleneck detection, code optimization suggestions, resource optimization, and performance enhancement recommendations.

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

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

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

User Timing polyfill

Perform data joins with any type of JS objects

Size Limit preset for applications

vitest plugin for CodSpeed

@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

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

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

Core library for Instana's Node.js packages

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

Parse performance test results from JMeter and many more

ultility to measure execution time

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

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

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

Mixins that manage rendered CSS from modular importing

infinite-scroll, done right. done.

Size Limit preset for big open source libraries

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

A performant virtual scrolling list library

Optimize the speed of important tasks on limited ressources

measure startup time of your react-native app

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.

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.

A JavaScript library for zooming images like Medium

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

Customize scrollbar in modern browsers with smooth scrolling experience.

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

Smooth page transitions, smart preloading and more in Astro

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

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

A d3.js library to produce flame graphs.

requestAnimationFrame pool to avoid busyness on the thread

Better Stack Telemetry Next.js client

redux store enhancer which allows batching subscribe notifications.

The linting tool for the web

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

request animation frame

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

Like Underscore, but lazier

Automatically sort your head with capo.js in Astro

Compress 🗜️

webhint's recommended hints configuration for live websites

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

Collection of utilities for InfernoJS

A dead simple benchmarking framework

request animation frame

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Generate performance statistics for async or sync functions

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

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

Breakpoints mixin pack for Seed

Run gulp tasks in separate cpu processes

Playwright plugin for analyzing test flow performance

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

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

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

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

A comprehensive Model Context Protocol (MCP) server that provides web performance auditing, accessibility testing, SEO analysis, security assessment, and Core Web Vitals monitoring using Google Lighthouse. Enables LLMs and AI agents to perform detailed we

@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

esbuild plugin for Size Limit

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

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.

Fast and small Node.js Worker_Threads and Cluster Worker Pool

Min Heap

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

Webpack Statoscope plugin for Size Limit

WebRTC2 Utils - Cross-platform WebRTC utility functions for device detection, media management, error handling, and performance optimization

Lazily render react components

Compress 🗜️

Core optimization features for ZenReact - High-performance React state management and rendering optimization

Inspect module load time with performance.measure

High performance debug logging

Benchmark.js compatibility layer for CodSpeed

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.

NextJS version of Webpack Bundle Analyzer.

Scan your entire website with Google Lighthouse.

Node.js SDK for Dynatrace OneAgent

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

A gzip, brotli and zstd compressor for Astro

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

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

Performance optimization tools for OrdoJS applications

WebRTC2 Utils - Cross-platform WebRTC utility functions for device detection, media management, error handling, and performance optimization

A thin wrapper around fetch that prevents duplicate requests.

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

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

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

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

memoize the last result, in async way

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

Functional CSS for humans

Blazing fast flame graphs for V8 and Node

A high-performance charting library.

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

Use Qwik components and Resumability within Astro

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

Efficient shallow equality algorithm that also allows checks for react element equality of children props

Use Alpine within Astro

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.

<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

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

Monitor your web app's performance

Performance optimization helper for React applications

ObserveRTC Client Integration Javascript Library

The hapi utility toy chest

React component for visualizing profiling data

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

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

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

The modular and type-safe form library for Qwik

Very simple module to calculate block execution time.

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.

Measure Babel compilation time

WebPageTest API wrapper for NodeJS

react StaticContainer

Fast and consistently responsive apps using a single function call

Border theme pack for Seed

Props mixin pack for Seed

Cutting edge GraphQL planning and execution engine

Lazy loading for express router

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

Imagemin meets Rollup!

A simple requestAnimationFrame wrapper with added iteratee creator.

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.

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

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

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

Fast cartesian product

The modular and type-safe form library for SolidJS

the fastest function for deep clone js objects compatible with es6

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

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

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.