Every "load more" is slower than last one

When clicking "load more", every next time load is longer than the previous one. This is actually borwser processing time, as AJAX response loads in more-less the same time.

Eventually a browser throws an error that script execution time is too long.

This is caused by:

    var $existing_view = this;
    var $existing_content = $existing_view.find('.view-content').children();
    $new_view.find('.view-content').prepend($existing_content);
    $existing_view.replaceWith($new_view);
    $(document).trigger('infiniteScrollComplete', [$new_view, $existing_content]);

That is loading the entire view content into memory and processing this whole heap of data instead of just appending new content to the right container.