YSlow analyzes web pages and suggests ways to improve their performance based on a set of rules for high performance web pages. Feature highlights:
Google Chrome Store : https://chrome.google.com/webstore/detail/ninejjcohidippngpapiilnmkgllmakh?utm_source=chrome-ntp-icon
3.Neustar Web Performance
Traditional load testing is done inside the firewall. But many of today's applications are found externally—ad servers, news tickers or Web analytics engines. That's why Neustar takes your customer's perspective and tests from the inside out. It's the best way to see if your website is ready for peak usage.
Link ; https://browsermob.com/free-website-performance-test/
Run a free website speed test from multiple locations around the globe using real browsers (IE and Chrome) and at real consumer connection speeds. You can run simple tests or perform advanced testing including multi-step transactions, video capture, content blocking and much more. Your results will provide rich diagnostic information including resource loading waterfall charts, Page Speed optimization checks and suggestions for improvements.
Link : http://www.webpagetest.org/
5.GTmetrix
GTmetrix can help you develop a faster, more efficient, and all-around improved website experience for your users.
Link : http://gtmetrix.com/
We built this Full Page Test tool to help you analyze the load speed of your websites and learn how to make them faster. It lets you identify what about a web page is fast, slow, too big, what best practices you're not following, and so on. We have tried to make it useful both to experts and novices alike.
In short, we wanted it to be a free, easy-to-use tool to help webmasters and web developers everywhere optimize the performance of their websites.
Link : http://tools.pingdom.com/fpt/
With Site-Perf.com, you get an accurate, realistic, and helpfulestimation of your site's loading speed. The script fully emulatesnatural browser behaviour downloading your page with all the images, CSS, JS and other files – just like a regular user. Spot bottlenecks, reach perfect performance and balance your site load with Site-Perf.com, a smart and flexible testing tool. Focus on important things while Site-Perf.com delivers the speed facts straight to your screen. Try it right now!
Link : http://site-perf.com/
The page analyzer analyzes your web page performance by emulating how a web browser would load your page and all resources referenced in it. The page and the referenced resources are loaded and important performance metrics are measured and displayed in a waterfall diagram along with other per-resource attributes such as URL, size, compression ratio and HTTP status code. Each load time bar has parts of different color corresponding to a performance metric:
Link : http://loadimpact.com/
These are the most wanted tools that giving you useful result and ideas to improve your website to perform well.... hope this help you guys and your comments are welcome...