Taking Too Much Time on generating docx and converting to PDF

dmex-thanesh

Subject: Performance Optimization Request for DOCX to PDF Conversion Using LibreOffice/Unoconv
Description:
We are currently generating PDF files from DOCX templates using both JSReport and a custom Node.js script that utilizes LibreOffice (via libre.convert) and unoconv. Below are the two approaches we've tested:
Approach 1: JSReport Configuration

{
"template": {
"recipe": "docx",
"engine": "handlebars",
"unoconv": {
"format": "pdf"
},
"docx": {
"templateAsset": {
"content": "<base64-encoded-wordDocumentBuffer>"
}
}
},
"data": "Objects"
}

Approach 2: Node.js Script Using LibreOffice (LibreOffice Convert)

function convertDocxToPdf(docxBuffer) {
return new Promise((resolve, reject) => {
const extend = ".pdf";
libre.convert(docxBuffer, extend, undefined, (err, pdfBuffer) => {
if (err) {
return reject(
new Error("Error during DOCX to PDF conversion: " + err?.message)
);
}
resolve(pdfBuffer);
});
});
}

Issue Observed:
On Linux systems, the conversion is fast and works as expected.
On Windows systems with high configuration (e.g., 16GB+ RAM, SSD), the performance is acceptable.
However, on Windows systems with lower specs (e.g., 8GB RAM), both methods take around 15–20 seconds for a single DOCX to PDF conversion.
We have tested with:
LibreOffice direct CLI conversion
Unoconv package
JSReport with unoconv recipe
But in all cases, the conversion time is consistently slow on low-end Windows systems.
Here, We are looking to consistently reduce conversion time to under 10 seconds on all environments.