WordPress “Loop” with large set of results

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You can use the Transients API to cache the entire HTML output so the queries are not done every time the page is loaded:

$transient="my-300-posts";
$timeout   = 3600; // 1 hour

if ( false === $out = get_transient( $transient ) ) {

    $args = array( YOUR ARGS GO HERE );
    $posts = get_posts( $args );
    if ( $posts ) {
        foreach ( $posts as $post ) {
            $out .= get_the_title( $post->ID );
            $out .= // whatever else you want to output...
        }
    }

    if ( $out ) {
        set_transient( $transient, $out, $timeout );
    }

}

echo $out;

However, you’re still serving 300 post thumbnails on one page load, which is a lot of data to transfer.

(You also need to delete the transient on the save_post and delete_post hooks)

Maybe you’d be better off with infinite scrolling? It’s an option in the Jetpack plugin.

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