Page speed is a ranking factor, and the reason is clear. In this fast era, nobody is willing to wait for information from a site if there are other faster options.
What happens if you open a page and wait more than, let’s say 3 seconds? You probably hit the back button and look for another result.
Google collects these signals and takes them into consideration in their algorithm.
To test the page speed, you can use PageSpeed Insights from Google. Besides the speed score, you’ll also get tips and hints on how to improve the site speed.