phpword addHtml速度慢

I create html template with images <img> Then use such code

$phpWord = new PhpWord();
    \PhpOffice\PhpWord\Settings::setOutputEscapingEnabled(true);
    \PhpOffice\PhpWord\Settings::setTempDir('/tmp');

    $section = $phpWord->addSection();
    \PhpOffice\PhpWord\Shared\Html::addHtml($section, $htmlData);

    $objWriter = \PhpOffice\PhpWord\IOFactory::createWriter($phpWord, 'Word2007');
    $objWriter->save($docx);

Generation is very slow, even if use 1 image

If use more 1 image it much more slow

How to increase speed?