You can check whether or not your images are responsive by hitting CMD+SHIFT+O on your keyboard. Or CTRL+SHIFT+O on your PC. You are using the responsive image feature …
Still, you need to optimize your images …
I have attached your optimized images as a zip to this post.
With just two clicks, I can get all your images used down to 1,6mb total.
Download it here.
you just need to run this scroll down and click on “download optimized images”
If you want to optimize your other images, just past in another url. Its a quick n dirty way to optimize.
I hope that is what you meant because I didn’t quite understand the question.