Why A Fast Website Is A Good Thing
Since always, speed was a paramount element for Internet sites. The search engines indeed take into account the loading time of the pages of an Internet site for their ranking in the SERP.
For example, Google considers that a Web page which puts more than 1.5 seconds to load is a too slow page and is thus likely to be penalized. Google, and the other search engines, wish to propose in their SERP Internet sites which load quickly, in order to propose the best possible experiment with their Net surfers.
If you want to measure the loading speed of your Internet site and to thus know the improvements which you must make to accelerate loading of it, then I recommend to you to use the tool of Google, PageSpeed or the tool of GtMetrix.
Since February 24th, 2016, Google deployed an update named AMP (Accelerated Mobile Pages) which proposes the Web pages which load most quickly. Thus, by having a fast Internet site, you will have a better exposure in the SERP.
Having a fast Internet site is thus not only one advantage for the SEO but it is also a comfort which you offer to your users and who will thus not hesitate to return back on your Website.
Will know that if you use CMS like WordPress, there exist plugins enabling you to accelerate your Internet site. In the same way, the use of CDN will also enable you to save loading time. There exist many ways to reduce the loading time, I shoed an article on this subject if you wish it.