Best Website Performance Tool

Seobility is a website speed testing tool that analyzes a webpage’s performance across multiple metrics like Core Web Vitals, Largest Contentful Paint, and Cumulative Layout Shift, providing detailed reports and actionable recommendations for optimization.

Google PageSpeed Insights is the go-to tool for understanding how your website performs in Google's eyes. It provides scores for both mobile and desktop, along with actionable recommendations based on Google's Core Web Vitals and other performance metrics. The tool integrates directly with Google Se...

Bundlephobia is a web performance tool designed to analyze website asset sizes. It identifies large JavaScript bundles and other resource files contributing to slow page load times. Developers utilizing front-end technologies like JavaScript can use Bundlephobia to optimize their websites for improv...

Sitespeed.io is an open-source tool designed for analyzing website performance. It provides data on key metrics such as First Contentful Paint and Time to Interactive, helping developers and site owners identify bottlenecks and optimize their websites for speed. The self-hosted nature of Sitespeed.i...

Lumar is a comprehensive web performance analysis tool designed for enterprise SEO professionals and technical teams. It utilizes a powerful crawler—similar in functionality to WebPageTest and Deepcrawl—to assess website speed and identify critical issues impacting user experience. The tool focuses...

Percy is a web performance monitoring tool designed to identify issues impacting website speed and user experience. It simulates various browsers to reveal bottlenecks such as oversized assets or slow server response times. This visual testing solution is valuable for developers, QA engineers, and d...

Blackfire.io is an online web performance analysis tool designed for developers and site owners. It uses real browser simulation to measure website loading speed and pinpoint bottlenecks. The platform offers detailed insights into metrics such as First Contentful Paint and Largest Contentful Paint,...

Google's Test My Site tool assesses a website's loading speed across mobile devices. It provides detailed reports pinpointing factors affecting performance such as image sizes and code efficiency. This resource is valuable for web developers, marketers, and anyone seeking to improve their site’s use...

Polypane is a web performance analysis tool designed for developers. It simulates browsing environments on desktop and through browsers like Chrome to evaluate website speed and identify issues with JavaScript, images, and network connections. The open-source nature of Polypane makes it particularly...

OctoPerf is an automated testing tool that measures the performance of websites and web applications by simulating real user behavior across multiple geographic locations and devices. It generates synthetic traffic to identify bottlenecks and assess key metrics like First Byte Time, Largest Contentf...

StormForge is an open-source tool that analyzes website performance by simulating real browser connections to identify and prioritize optimization opportunities like image delivery and asset loading strategies.

Fortio is an open-source website speed testing tool that analyzes a webpage’s performance by measuring various metrics like First Contentful Paint, Largest Contentful Paint, and total load time to identify optimization opportunities.

KeyCDN’s Website Speed Test utilizes the WebPageTest platform to measure website loading times across various locations and connection types, providing data on First Byte Time, Fully Loaded Time, and other performance metrics for analysis.

Speedscale is an open-source tool that analyzes website performance by measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed reports on loading speed and potential optimization opportunities.

StatusGator is a free online tool that analyzes website loading speed across multiple global servers and reports the average page load time, along with key metrics like First Byte Time and Fully Loaded Time, providing insights into performance bottlenecks.

Ghost Inspector is a free, open-source browser extension that analyzes website performance by simulating a real mobile device’s network connection and measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive.

Hyperping is an open-source tool that analyzes website performance by simulating multiple HTTP requests to measure server response times and identify potential bottlenecks impacting page load speed from various geographic locations.

Sensu is an open-source tool that analyzes website performance by measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed insights into loading speed and user experience.

Uptrends Website Speed Test is an online tool that measures the loading time and performance of websites by analyzing various factors like DNS resolution, connection times, and content download speeds, providing detailed metrics for optimization.

Loadster is a free online tool that analyzes website loading speed by simulating various network conditions and measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive for objective performance data.

FusionReactor is an open-source tool that analyzes website performance by simulating real browser behavior and measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed insights into page load speed issues.

SpeedVitals is a website tool that analyzes webpage loading speed by measuring various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing data-driven insights for optimization.

Loadmill is an open-source website speed testing tool that analyzes a webpage’s performance by measuring various metrics like First Contentful Paint, Largest Contentful Paint, and total load time, providing detailed insights into optimization opportunities.

Netpeak Spider is a free online tool that analyzes website loading speed by simulating a browser’s behavior, measuring key metrics like First Contentful Paint and Largest Contentful Paint to identify performance bottlenecks.

Highlight.io is a website speed testing tool that analyzes webpages using Lighthouse and PageSpeed Insights to provide detailed reports on performance metrics like First Contentful Paint, Largest Contentful Paint, and Core Web Vitals, aiding developers in identifying optimization opportunities.

Tsung is an open-source command-line tool that analyzes website performance by simulating browser rendering and measuring various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed insights into page load speed.

Sa11y is an open-source, command-line tool that analyzes website performance by measuring various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed insights into potential optimization opportunities.

Sitechecker analyzes website loading speed across multiple global locations and browsers, providing detailed reports on performance metrics like First Input Delay and Largest Contentful Paint to identify optimization opportunities.

SpeedOf.Me is a free online tool that analyzes website loading speed by measuring key metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing insights into potential performance bottlenecks.