Page Speed Idea

Good plugin I love to use it.
But I have a request.

When I check my site pages in gtmetrix or in google page speed insights, I go to know that the images of the post itself are taken in post grid. This leads to slow site speed because large images are later scaled down for small sizes of post grid.

Please do something and generate small grid images and keep them in the backend, so that the images must not be scaled down while loading the page. This will help me a lot to make my site faster.

If such option already exists please tell me how to use it