YSlow
Business Profile
Core Value Proposition
YSlow provides web page performance analysis and improvement recommendations based on Yahoo!'s performance rules for high performance web pages.
Target Customer
Web developers and performance engineers who analyze and optimize web page performance, including users of Firebug in Firefox and other browser extensions (Chrome, Opera, Safari)
Key Differentiator
Open-source, rule-based performance analysis tool that grades pages using a defined set of testable rules from Yahoo!, with customizable rulesets and cross-browser/extension support (including Firebug integration and tools like Smush.it and JSLint).
Implementation Timeline
Not specified in the provided content
Pain Points
- 1Identify why a web page is slow and what to fix
- 2Provide actionable, rule-based suggestions to improve performance
- 3Summarize page components and overall page weight to guide optimization
Key Features
- 1Analyzes web pages and identifies performance issues based on testable rules (23 of Yahoo!'s 34 rules)
- 2Provides actionable suggestions for improving page performance
- 3Summarizes page components and displays statistics
- 4Shows a grade per rule and an overall page grade with a weighted score
- 5Offers multiple rule sets (YSlow V2, Classic, Small Site or Blog) and customization via custom rule sets
- 6Tools for performance analysis including Smush.it and JSLint
- 7Cross-browser availability and integration options (Firefox with Firebug, Chrome, Opera, Safari, etc.)
- 8Printable views, beacons, and detailed component-level data (type, size, headers, etc.)
- 9CDN hostname customization and frame/iframe/component handling
Target Customer Industries
Client Results
- 1Improved web page response time by 25% to 50% in studies cited by YSlow documentation when following the performance rules
- 2Clear, actionable insights into components, weights, and headers to guide optimizations
- 3Per-rule and overall grade view to track performance improvements over time
Competitive Advantages
- 1Open-source with BSD-style licensing for most files (and noted licenses for included components)
- 2Based on Yahoo!'s defined web performance rules, with a structured, testable rule set
- 3Customizable rulesets and the ability to add your own CDN hostnames for Rule 2
- 4Deep analysis includes both DOM crawler data and Net Panel data integration for components
- 5Multi-platform availability (Firefox/Firebug, Chrome, Opera, Safari, Node.js, PhantomJS, etc.)
Key Benefits
Additional Product Information
Product Description
An open-source web page performance analysis tool that analyzes pages and offers improvements based on Yahoo!'s rules for high performance web pages.
Target Market
Web developers, performance engineers, and site owners seeking to optimize page load performance and understand component-level impacts
Unique Value Proposition
Open-source, rule-based performance analysis with customizable rule sets, cross-browser support, and built-in tools to identify and fix slow web pages based on a well-established set of performance rules.
Technical Requirements
Browser extensions for Firefox (with Firebug), Chrome, Opera, Safari; Command Line (HAR); PhantomJS; Node.js Server; Source Code available for self-hosted setups
Pricing Model
Open-source and free to use; most files licensed under the New BSD License
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