Learn how to speed up WordPress websites by using the correct image sizes using the old legacy Gtmetrix report. The new lighthouse performance report gives the details of the images that need to be properly resized, but unlike the older report, it does not gives you the indication of what height and width the images should be, nor shows the optimized version of the images.  Thus, the old Gtmetrix also called the legacy reports, comes very handy when making changes to images manually as it will give you the exact specifications required for your WordPress websites.

In this tutorial, we will not be using any plugins and only give you a brief idea of how you can go back to the old Gtmetrix and figure out the right image sizes. Here are some other important lessons in optimizing the images for a better score for your website.

Here are other tutorials to improve your GTmetrix Score:

• To serve Scaled Images & Optimize Images: Click here
• Serve images in Next-Gen Formats ( convert using Photoshop): Click here
• Preload key requests: Click here
• To improve Add Expire Headers & Leverage browser caching: Click here
• For Defer Parsing of JavaScript: Click  here
• Cache configuration as recommended by GTmetrix: Click here
• Loading jQuery from the Google CDN: Click here