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http://www.hongkiat.com/blog/website-speed-and-performance-check-tools/

Website Speed and Performance Checking Tools

Google is taking site’s loading speed into consideration in determining its ranking. Even though this will not land a big impact, it is still something we (webmasters) should really look into . The reason is pretty simple – majority of visitors are usually in rush and no one is fond of waiting half a century before the website finally load its content or failed to load. In another words, if your site is slow, you are subjected to lose a lot of visitors. Visitors are traffic, traffic affects reputation and they can potentially generate revenue. It can be a domino effect if one ignore the consequences of a slow-loading site.
CoolGoogleTools

Server side image requests Javascript is “client side”; this means the browser does all the calculations and actions that the script requires. PHP, ASP, Perl and many others are server side scripting languages; which means the server that hosts the website does all required calculations.

Google Analytics without javascript! « link love

http://www.vdgraaf.info/google-analytics-without-javascript.html