Serve properly sized image using theme widget

Hi,
I’m wondering how I can serve properly sized images in a widget that came with a theme. I can’t go to the theme author because unfortunately they are terrible at support.

The problem I’m having is we are using a widget that displays several rows and columns of products in a grid and resizes the images for this. Yet the widget just pulls the regular sized images and then shrinks them down to fit where it needs them. This of course raises the page load time considerably.

I looked in the widget and there is no way to select an image. It just uses the default image. I need to speed up this page. Is there a way I can fix this or should I just get rid of WooCOmmerce because we don’t even use it for the transaction. It is only a nice way to display the product.

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