Does the theme generate smaller images

Hello,

The images you’re seeing are there so that you always have an optimal image size to display for all devices that visit your site. It also resizes them to display thumbnails properly. If you want your site to be responsive and optimized, then they are necessary.

Make sure that you’re compressing images before uploading and using other methods to optimize them and they will not have a noticeable effect on site performance.
https://www.kadencethemes.com/best-practices-for-images-sizes-and-optimization-in-wordpress/

-Kevin