Cache com Transients

function get_posts_em_destaque(): array {
  $cache_key = 'posts_destaque';
  $posts     = get_transient($cache_key);

  if ($posts === false) {
    $posts = get_posts([
      'post_type'      => 'post',
      'posts_per_page' => 5,
      'meta_key'       => '_destaque',
      'meta_value'     => '1',
    ]);
    set_transient($cache_key, $posts, 12 * HOUR_IN_SECONDS);
  }

  return $posts ?: [];
}

// Invalidar cache ao salvar post
add_action('save_post', fn() => delete_transient('posts_destaque'));