class MyModel extends MemoizingModel
{
    protected static $memoized = ['slow_attribute'];

    //Now only slow the first time it's accessed
    public function getSlowAttribute($value)
    {
        sleep(3);
        return ucwords($value);
    }
}

class TraitModel extends Model
{
    use Memoizes;
    
    /**
     * Initialize attributes
     *
     * @return void
     */
    public static function boot()
    {
        parent::boot();
        static::setMemoized(['slow']);
    }

    //Now only slow the first time it's accessed
    public function getSlowAttribute($value)
    {
        sleep(3);
        return ucwords($value);
    }
}