Best Website Performance Tool

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 website diagnostic tool that analyzes the file size of a webpage’s assets – images, scripts, and stylesheets – to identify potential optimization opportunities for faster loading times. It focuses on reducing redundant or oversized resources.

Sitespeed.io is an open-source toolkit for measuring and improving website performance by analyzing various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, offering detailed insights into page load speed issues.

Blackfire.io is a free online tool that analyzes website loading speed by simulating real browser performance, providing detailed metrics like First Contentful Paint and Largest Contentful Paint to identify optimization opportunities.

Lumar 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.

Bombardier is a website speed testing tool developed by Dareboost that analyzes a webpage’s performance across various metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing detailed insights for optimization.

Percy is an open-source tool that analyzes the loading speed and performance of websites by simulating real browser behavior, identifying bottlenecks like large images or slow server responses.

Hey is a free online tool that analyzes websites to identify performance bottlenecks and provides actionable recommendations for improving page load speed, including suggestions for optimizing images, minimizing code, and leveraging browser caching.

TestMySite, part of Google’s Think With Google initiative, analyzes website loading speed and identifies technical issues impacting user experience through detailed performance reports and recommendations for optimization.

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.

Polypane is an open-source, Node.js-based tool that analyzes website performance by simulating real browser behavior and identifying potential bottlenecks related to JavaScript execution, image loading, and network requests.

Goose 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 Time to Interactive, providing detailed insights into potential optimization opportunities.

WhoCanUse is a website analysis tool that identifies the specific resources and elements contributing to a webpage’s load time, allowing developers and marketers to pinpoint optimization opportunities for improved performance.

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.

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.

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.

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...

HetrixTools is a free online website speed testing tool that measures website loading times and performance metrics like First Byte Time, Fully Loaded Time, and Page Size across multiple servers globally, providing detailed insights into network efficiency.

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.

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.

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.

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.

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.

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.

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.

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.

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.

The Cloudinary Website Speed Test is a web-pagetest tool that analyzes a website’s loading performance by simulating various user connection speeds and measuring metrics like First Contentful Paint, Largest Contentful Paint, and Time to Interactive, providing insights into optimization opportunities...