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 Firefox add-on integrated with the Firebug web development tool. YSlow grades web page based on one of three predefined ruleset or a user-defined ruleset. It offers suggestions for improving the page’s performance, summarizes the page’s components, displays statistics about the page, and provides tools for performance analysis, including Smush.it and JSLint.
3. Load Impact (Online testing)
This is used for Performance Testing (Load/Stress). It simulates users and access your website . It simulates large user load on web servers to determine whether or not they can handle the high traffic load. Free users can only attempt using 50 simulated users But this is very useful . The tool will check (ping) from different locations and results will display as a complete report with graphs