Shopware uses wrong values for the sizes attribute of thumbnails. Therefore bigger images are downloaded than shown. This increases the loading times.

It is not useful to download a thumbnail of 400 x 400 pixels if you show an image with 200 x 200 pixels.

If this is fixed you no longer need https://store.shopware.com/en/frosh56163799233f/lazysizes-and-lazyloading-for-suitable-image-sizes.html.

Shopware shows images of 430 x 430 pixels on product detail pages by default. Therefore thumbnails with 430 x 430 pixels should be created. On product detail pages the 400 x 400 pixels big thumbnails are not used for the normal product images and way too big images are downloaded.

These 2 problems increase loading times, waste server capacities and frustrate visitors and shop owners.