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

1Actionable, rule-based performance recommendations

2Detailed component and page weight analysis

3Customizable rulesets and multiple deployment options across browsers and CLI

4Integration with Firebug/Firefox and availability as browser extensions

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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