Are you sure it's not lazy load? If i scroll down the image on this website is shown less than 5s@Ekaterina Sayapina
have a look in the website of our co-member above ,have also the same issue in the homepage image in the mobile view (delay image ,over 2 minute to appear)
Can you contact the mailchimp for woocomerce plugin developer as well?
as the above website was a custom store create by alidropship team!!!