Show a limited number of cards in the DOM at any given time for performance reasons.

[mihaisavezi]

Split items into chunks.

When there are for example more than 40 slides in the DOM at any given time, remove the ones at the start and if the user goes back to the first pages where they reside, make a request to load them.

slides = ['20 item array'];
max = 30;

when the user navigates to an item in the slides with an id > 20, request an additional 20 items.
and remove the first 10 from the array, to keep the number of dom elements < max.

we only display items 9 to 39

The idea is to not exceed a given max nr. of items in the DOM at any given time.