GT Metrix

GTmetrix is ​​one of the most popular tools on the market for analyzing the page loading speed of a website.
GTmetrix Grade

GTmetrix Grade indicates the overall rating for the tested website, including both how fast it loads and how well it’s built. Aim for A or B rating.

Waterfall charts

The GTmetrix Waterfall Chart shows the request-by-request loading behavior of your webpage, and is one of the most useful features for troubleshooting and debugging performance issues.

Summary Tab

This  lets you know what are the top issues and what elements of the website are the heaviest to download.