Is it possible to speed up the process of converting doc to pdf with LibreOffice?

Question

PHP

Faced such a problem that the conversion of a .docx document takes a long time, are there any solutions to somehow speed up the conversion process. Other scripts, software or methods?
Here is the code to convert.
Win Apache LibreOffice

$config = array(
  "lib_office_exe" => '"D:/LibreOffice 4/program/soffice.exe"'
);

function convert_to_pdf($filepath)
{
  global $config;
  exec($config['lib_office_exe'] . " --headless --invisible --convert-to pdf " 
    . $_SERVER['DOCUMENT_ROOT'] . '/' . $filepath 
    . " --outdir " . $_SERVER['DOCUMENT_ROOT'] . "/temp/");

  header("Location: /temp/" . basename($filepath, ".docx") . ".pdf");

}

convert_to_pdf("PSF.docx");

Answer 1

I don't know, I always convert with TotalPDFConverter . Turns out pretty fast

Answer 2

So it can be a problem on Windows?
Is it in production too long?