Hi, yes it appears that GT Metrix does not read the current code. We have provided recommended items that we can ask to the Theme Author to help our website pass the site speed test:

Serving Scaled Images

>Is it possible to create custom sizes for the srcset for serving scaled images.
(See attached screenshot)

>Make Image code support both server scaled and retina image.

So that images can be properly sized depends on the container/browser size, and at the same time they are Retina (crisp) image

>Ability to customize code for images.

>Change the actual size of the Instagram images being loaded in Instagram carousel.

GTMetrix is complaining about images in Instagram carousel that are not server scaled. We can’t edit the code for those images because it came from an Instagram plugin.

Defer Parsing of Javascript files

>Add code in functions.php to defer parse javascript files.