The Need for Speed
How fast your website displays in a visitors’ browser is very important. An MIT Technology Review article stated that 49% of users abandon a site or switch to a competitor after experiencing performance issues. If it takes too long for your site to load in a browser, visitors will go elsewhere.
Google Page Speed is a free tool that analyzes the content of a web page and then generates suggestions to make that page load faster. Reducing page load times will reduce the number of people who leave your site early and increase conversion rates.
Page Speed provides an overall score between 0 and 100. In addition, it also provides a general score for each rule, using a simple red-yellow-green grading scheme.
Google Page Speed Online