long donwload time in ie8 and ff - Page 1

long download time for ie and ff - which may be the problem

my script-code:

f(class_exists('HTML2PDF')) {
$html2pdf = new HTML2PDF('P','A4','de');
$html2pdf->pdf->SetAuthor('test');
$html2pdf->pdf->SetTitle('test);
$html2pdf->setDefaultFont('Arial');
$html2pdf->writeHTML($doc, false);
$html2pdf->Output('test.pdf','D');
}

thanks

how many time does it take ? and what is the size of the PDF file ?

the filesize is 188kb.
start I the download in my backend (CRMS), is one second download finish