dompdf error 500 and very slow when download

Hi i use dom pdf for generate my report and i use stored procedure from sql server to get data

I use filter start date and end date for print period of report

Here is my controller :

public function print_pdf(Request $request)
{
    $start_date = $request->start_date;
    $end_date = $request->end_date;

    $ppra = DB::select('EXEC SPGetPPRA ?,?', array($start_date, $end_date));

    $pdf = PDF::loadView('ppra.pdf', compact('ppra'));
    $pdf->setPaper('a4', 'potrait');
    return $pdf->stream();
}

Any idea for fixed this problem?

via Chebli Mohamed