Yahoo! YSlow
YSlow is a Firefox and Chrome browser extension that analyzes web pages and suggests ways to improve their performance based on Yahoo!'s performance best practices. It grades performance and provides tips to optimize page load speed.
Yahoo! YSlow: Performance Analysis and Optimization Tool
YSlow is a Firefox and Chrome browser extension that analyzes web pages and suggests ways to improve their performance based on Yahoo!'s performance best practices. It grades performance and provides tips to optimize page load speed.
What is Yahoo! YSlow?
YSlow is a free open source web performance tool developed by Yahoo!. It is available as an extension for Firefox and Chrome browsers.
YSlow analyzes web pages and gives them a grade based on performance best practices identified by Yahoo!. It looks at factors like minifying code, compressing images, using a content delivery network, and more. For each factor, YSlow provides a tip on how to optimize it.
The goal of YSlow is to help web developers improve the speed at which web pages load. Faster page load speeds lead to better user experience. Some of the specific page load optimizations YSlow recommends include:
- Minify JavaScript and CSS files
- Add browser caching headers
- Optimize images
- Reduce DNS lookups
- Reduce number of DOM elements
- Enable gzip compression
After analyzing a page, YSlow gives it an overall performance grade from A to F. It also provides a waterfall chart showing all the page components and resources loaded, highlighting where optimizations can be made.
YSlow is a useful tool for web developers to test and improve their site's performance. Optimizing page speed can reduce bounce rates, improve SEO rankings, and lead to higher user engagement and revenue.
Yahoo! YSlow Features
Features
- Grades web page performance
- Analyzes page components like JS, CSS, images
- Provides optimization tips
- Integrates with Firefox and Chrome browsers
- Open source tool
Pricing
- Free
- Open Source
Pros
Easy to use
Helps improve page load speed
Identifies performance bottlenecks
Free to use
Cons
Limited to Firefox and Chrome browsers
Suggestions not always applicable
Can only analyze one page at a time
Official Links
Reviews & Ratings
Login to ReviewThe Best Yahoo! YSlow Alternatives
View all Yahoo! YSlow alternatives with detailed comparison →
Top Web Browsers and Performance Testing and other similar apps like Yahoo! YSlow
Here are some alternatives to Yahoo! YSlow:
Suggest an alternative ❐
GTmetrix
GTmetrix is a powerful and free online tool that analyzes web pages and provides detailed recommendations for improving web page speed performance. It offers comprehensive web page analysis by testing page load speeds from multiple locations worldwide, assessing performance using various connectivity types, and running Google PageSpeed and YSlow tests.After...
KeyCDN Tools
KeyCDN Tools is a free suite of web performance and SEO optimization tools offered by KeyCDN, a content delivery network (CDN) provider. It is designed to help website owners enhance their site's speed, security, and search engine visibility.The tools suite includes:PageSpeed Insights - Analyzes page load speed and performance on...
Google Lighthouse
Google Lighthouse is an open-source, automated tool for improving the quality of web pages. It is developed by Google as part of the Chromium project.Lighthouse audits web pages for performance, accessibility, progressive web app capabilities, and more. It generates a report showing scores for each category and suggestions for improvements....
PageSpeed Insights
PageSpeed Insights is a free web performance analysis tool provided by Google. It analyzes the content, assets, and structure of a web page then generates suggestions on how to improve page load speed and user experience.Specifically, PageSpeed Insights examines metrics like:Page load timeTime to interactiveFirst contentful paintFirst CPU idleSpeed indexIt...
WebPageTest
WebPageTest is an open-source website performance testing tool developed by Google. It allows users to test the load times and performance of any website from locations around the world. WebPageTest measures vital web performance metrics like:First Contentful Paint - When the first bit of content renders on the pageSpeed Index...
Checkbot
Checkbot is a website auditing and SEO tool used to analyze web pages to identify issues that may negatively impact search engine optimization and user experience. It is designed to help content creators, web developers, and SEO professionals improve their websites.Some of the key things Checkbot checks include:Broken links and...
Pingdom Website Speed Test
Pingdom is a popular website monitoring and speed test service used to track website uptime, availability, and performance. It provides insights into website speed from multiple global locations, helping identify performance issues and opportunities to optimize.Key features of Pingdom include:Page speed tests - Pingdom checks page load time, size, and...
Cutestat
Cutestat is a free and open source web analytics software used by website owners to track traffic and analyze visitor behavior. It provides a variety of statistics to help understand website performance.Some key features of Cutestat include:Tracking number of visits, unique visitors, page views, bounce rates and moreGraphical analysis of...
Screpy
Screpy is an open-source web scraping framework for Python designed for simplicity and extensibility.It allows extracting structured data from websites using a simple API. Screpy handles JavaScript pages, caches responses, and supports exporting data to multiple formats like JSON, CSV, and Excel.Some key features of Screpy:Simple and intuitive API for...
Yellow Lab Tools
Yellow Lab Tools is an open-source collection of apps and plugins for macOS created by Santiago Lizardo. It aims to enhance productivity, workflow customization, and efficiency for Mac users through thoughtful automation and quality of life improvements.Some of the key features and tools in Yellow Lab Tools include:Rectangle - An...
Web.dev
web.dev is a web developer resource created and maintained by Google to help web developers build fast, modern web applications. Some key aspects of web.dev include:Performance guidance and optimization tips - web.dev provides extensive documentation and guides on critical web performance topics like Core Web Vitals, page speed optimization, image...
Domsignal
Domsignal is an open-source application for monitoring websites and web applications. It provides users with the ability to track website changes, performance metrics, and uptime from one centralized dashboard.Some of the key features of Domsignal include:Website change monitoring - Get notified when there are changes to your website's content, code,...
StatusCake Tools
StatusCake Tools is a free suite of tools offered by StatusCake for monitoring website uptime, performance, and availability. It includes several useful tools:Website Monitoring - Set up detailed website monitoring to get alerts if your site goes down or becomes unresponsive.Page Speed Tests - Run page speed tests from multiple...
Raileo
Raileo is a comprehensive cloud-based platform designed for asset and fleet tracking needs. It enables organizations to monitor and manage vehicles, equipment, and mobile workers in real-time through GPS tracking. Key capabilities include:Real-time location and status monitoring - Track vehicles and assets on native and Web maps. Define geofences and...
PageSpeedAlarm.com
PageSpeedAlarm.com is a useful website monitoring service focused on tracking page speed. It works by periodically checking the page load time and performance of your website from various locations around the world.Some key features of PageSpeedAlarm.com:Set customizable alerts to be notified via email or Slack when your page speed drops...
WScore
WScore is an open-source web analytics platform built to provide website owners and marketers with powerful yet easy-to-use tools to understand and optimize their online presence. It focuses on actionable insights rather than vanity metrics.Some key features of WScore include:Intuitive dashboards and reports to track website traffic, top landing pages,...
User Probe
User Probe is a user research platform designed to help product teams conduct usability studies and collect qualitative user feedback. With User Probe, you can:Recruit participants that match your target user profileCreate and manage testing scripts with tasks, questions, notes and mediaConduct moderated remote user interviews and unmoderated user testsRecord...
