Google's main crawler is called Googlebot .Googlebot retrieves the content of webpages (the words, code and resources that make up the webpage).It then sends the information to Google.

It's all about speed - no one wants to wait for a page to load - and Google has been saying for ages that they want a super fast internet.Basically Page Speed can be simply stated as "the amount of time that it takes for a webpage to load."Sounds simple, but getting a page loading fast takes a lot of work. This includes having a fast host / server, optimizing page sizes and images and ctilizing a great CDN.