The speed of a website is one of the main causes for the failure or success. Many people consider their website very fast but it is true or not, because we can really see the speed of our website? If a page is definitely slow the user will leave and go to the next.
One of the main factors to consider Google to decide if our page will appear within the first organic results is the loading speed of (SEO).
There are many online tools to see the speed of your website, but what is the authentic instrument to control the speed of?
My advice is you should use Google Page Speed Insight
Just enter the url of the website and click analysis will show you speed scores and suggestions summary of your page on the result page.
Of course, you can use more different tools like pingdom, webpagetest...as other options.