延迟使用barryvdh / laravel-dompdf在lararvel中下载html2pdf

I am using barryvdh/laravel-dompdf to convert html page to pdf download. But I have little problem. Download process so long to loading. Here is my code. In controller

$sale = Sale::find($id);
    view()->share('sale', $sale);
    $pdf = PDF::loadview('sale.slip_out_pdf');
    return $pdf->download('slip_out.pdf');

Routes

Route::get('pdf/{id}', 'SaleController@pdf');

view

<a href="{{ action('SaleController@pdf',[$sale->id]) }}">Download PDF</a>