Better -1 posts_per_page for WP Query

query.php

<?php

$posts_per_page = 100;
$page = 1;
 
do {
    $posts = get_posts( [
        'posts_per_page' => $posts_per_page,
        'paged' => $page,
    ] );
 
    // Do stuff
 
    $page++;
} while ( count( $posts ) );