Hello,

In general, our theme is already optimized and doesn’t have too many resources to make your website slow.

Please check this manual for images configuration and site performance:
https://xtemos.com/wordpress-performance-optimization-the-ultimate-guide-in-2021/

You need to optimize images using a service like this: https://imagecompressor.com/ then upload images again. Alternatively, you can try to search for a plugin for this purpose to optimize directly in the site.

Best Regards.