Google is well-known for its fast searching engine as it can provide search queries within a count of half-second or even less.
Other services of Google perform considerable service for internet users as well except Gmail which sometimes shows poor performance. Google is typical with minimalist design. Yet, the speed performance of Google leaves no lack to the users to get the result of queries at once.

Good news. The key weapon of Google’s velocity is known as Page Speed, an internal tool that works to make efficient its site contents, is unfolded nowadays for website developers. Firefox plugin incorporated with Firebug is the first open-sourced tool that allows individual users to get the websites much faster than usual.

Excerpted from Google Blog Post:

A simple illustration on how Page Speed works to optimize your sites performance is that when you upload an image, compressed type of files will automatically provided for you. Thereby, you can directly display the compressed image on your site with no trouble. JavaScript or CSS which is used for faster display of your web pages can be identified obviously by Page Speed. The brilliance of this internal tool presents unquestionable comfort for individual users who are accessing your website accordingly.