Why does page speed optimization matter?
Load times are a major factor in Google's search engine algorithms. If your pages load fast, Google will rank them higher. If they load slowly, Google will rank them lower. Also, users' attention spans are shorter than ever and according to studies by Google the probability of a user abandoning your page increases drastically for every additional second that your page takes to load.
The percentage of visitors that leave a webpage without taking an action, such as clicking on a link, filling out a form, or making a purchase.
How high your page is listed in the search results on search engines like Google and Bing.