TG: Product Carousel optimizing size

Im using 2 TG: Product Carousel widgets on the frontpage.
The totaal size of this page is around 25 mb.
These 2 widgets are using more then 21 mb of it.

I like to reduce the size.
In the documentation the recommandation of the image is 444 x 444 px.
How can i do this?

Is there another solution to reduce the size of these widgets?

The page I need help with: [log in to see the link]