Hi
as for speed optimization issue is concerned there are lot of things which increase your website page speed. Please, optimize your images (reduce dimensions where it’s possible, optimize the size). There are a lot of services for this, for example, https://kraken.io/
Also, install cache plugin, for example, W3 Total Cache, some required settings you can find here https://www.8theme.com/topic/fixing-pagespeed-issues-once-and-for-all-could-apply-to-all-8themes-themes/
To optimize images you may try tinypng service, it’s better than kraken and has the free plugin for some amount of images.
Size of the images is WP autogenerated size http://prntscr.com/hfxqum for the every product image. I have changed sizes to more correct in your case. Detailed information about these dimensions you can get here https://docs.woocommerce.com/document/fixing-blurry-product-images/
