I'm using Magento 2.2.3 with a theme based on luma theme, no change did to the product images gallery. Images have all low size, even so, it takes like 3-4 seconds to load the first image. I have tried the Xumulus extension, but is not really a great choice, as it loads the image first, but delay all the js, so for a few seconds can't do pretty much nothing, like adding to cart.
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Is cache enable or disabled? – Suresh Chikani Aug 8 '18 at 5:00
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yes, I'm using varnish cache – alexcr Aug 8 '18 at 14:39
Run this cli command
php bin/magento setup:static-content:deploy
