If your store has more than 1500 products, the Related Items recommendation box has a slightly different behavior.

When you install the app, or run a Manual Product Sync, the related items for your top 1500 most popular products are calculated right away, and the remaining will be calculated one by one by-demand (meaning they will be processed the first time a user visits those products on the site).

The by-demand Related Item calculations are usually delivered within a few seconds after the first user visit, but depending on website traffic, time of day, and other server related conditions, it might take up to a couple of hours.

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