YSlow - Official Open Source Project Website
Official YSlow Open Source Project Website. YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages.
YSlow is a tool that analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. It integrates with the Firebug web development tool for Firefox and provides grades for each rule, an overall performance score, and tools for performance analysis, including Smush.it™ and JSLint.
135K
4500 / day
150K
5000 / day
3.8 min
2.5 pages per visit
40%
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Domain Rating
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Domain Authority
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Citation Level
2007
English, etc
Website Key Features
Performance Grading
Grades web pages based on predefined and customizable rules for high performance.
Integration with Firebug
Seamlessly integrates with Firebug, a web development tool for Firefox, for easy access and use.
Smush.it™ Integration
Provides tools for image optimization directly within the YSlow interface.
JSLint Integration
Offers JavaScript code quality checks to improve the performance and reliability of web applications.
Component Analysis
Analyzes all components of a web page, including JavaScript, CSS, and images, to identify performance bottlenecks.
Statistics View
Displays detailed statistics about the web page, including size, number of requests, and load time.
Customizable Rules
Allows users to customize the ruleset used for grading to fit specific performance goals or requirements.
Performance Reports
Generates detailed reports on web page performance, including suggestions for improvement.
Network Timing
Provides insights into the network timing of web page components to help identify and resolve delays.
CDN Analysis
Analyzes the use of Content Delivery Networks (CDNs) and suggests optimizations for better performance.
Similar Sites and Competitors
Additional information
Creator
YSlow was originally developed by Yahoo!'s Exceptional Performance team.
Open Source
YSlow is open source, allowing developers to contribute to its development and customize it for their needs.
Compatibility
While originally designed for Firefox with Firebug, YSlow has been adapted for use with other browsers and tools.
Community Support
YSlow has a strong community of users and developers who contribute to its ongoing development and support.
Educational Resource
YSlow serves as an educational resource for web developers looking to improve their understanding of web performance optimization.
HTTP headers
Security headers report is a very important part of user data protection. Learn more about http headers for yslow.org