No need to download or install, just fire up your browser, go to these sites and input the URL of your application under test.

1. Web Page Analyzer (http://www.websiteoptimization.com/services/analyze/)

This is a free helper website, which gives you a diagnosis of  the elements,  size and download time of your web page.  If it’s your first time to do performance test, this tool is a good start. The generated web page speed report will provide you an analysis and recommendations on how to optimize your site. Cool huh!

2. Gomez Instant Site Test (http://www.gomez.com/info_center/instant-test.php)

A performance tool which will help you know how your website is performing from a specified testing location. This instant test provides page download time, DNS lookup, connection time and all page objects.

By the way these are just helper sites to better optimize your webapps, but there are a lot of free performance tools out there like Jmeter, OpenSta etc. that can give you more concrete analysis of your website’s performance.

Happy testing