Issue in filter on collection page

[itsomayr]

Hi there, 

I'm using Turbo theme on my store. On the collection page, when I apply the sorting filter, the images of the products don't load up. 
Here's the link to one of the collections: https://serenityoptical.com/collections/timex

Here's indicated the filter, 

 

After applying the filter, it stays like this for 10-15 minutes.

Please guide how to resolve this issue. Thanks.