GTmetrix has changed how it reports and is now using Lighthouse metrics. One of the biggest issues that have arose from this is using explicit width and height for image elements.
We've set up a single variable environment using WPEngine to show the before and after results of using this solution for a site we just pushed live today.
We showed our method in depth in the video and have provided the html code below for your convenience.
If having a blazing fast website, with less plugins, a CDN, server side caching, and security interest you, I implore you to check out WPEngine. Our link gets you 4 months free - it helps you and it helps us keep providing you quick quality content to take your game to the next level. Thanks.
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https://shareasale.com/r.cfm?b=1640430&u=1852451&m=41388&urllink=&afftrack=
Code module here: https://trello.com/c/ppKp2ohF
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How to fix "Use explicit width and height on image elements" with Divi | NatokHD