All product images on Homepage use low resolution on mobile view

[variousfire]

All product images on Homepage use low resolution on mobile view.

http://demo.snstheme.com/wp/simen/?page_id=1808

http://displayhub.com.au/

But the same images are in high resolution in single product page.

Is there any chance to display high resolution product images on Homepage or Shop page on mobile view?

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