Does content load under hidden JS tab?

Question

JavaScript

It is necessary to make a portfolio of works of different people, for this I want to create categories using bootstrap and fill in about 20 photos for each category
and the question is how correct such a portfolio implementation is. That is, when the page loads and the first tab opens by default, will photos that are hidden under other tabs be loaded in the background? Just if yes, then it seems to me that it will not be very effective, since there can be 100-200 photos in total, and if they are loaded immediately, this will affect the page loading speed ....

Answer 1

Depends on the browser.
Use lazyload on images to be sure.

Answer 2

Content is loading. Use AJAX