Electron-pdf is taking 13-17 sec to convert 3 pages html to PDF

[MStefanov]

Hello,
I have been researching different tools, libraries and utilities for converting html to pdf and I came across electron-pdf. It is working very well for most of my cases - the output is accurate as I expected it to be (which was not the case with most of the other tools). However the generation is very slow - for the same html some of the utilities need 3-5 sec and electron-pdf needs 13-17 sec.
Probably I am not using it correctly or there is some additional configuration - an argument that should be passed along with the command.
For the moment I have electron-pdf on Windows 10 machine and I am using it through powershell or cmd. I am using the following command:
electron-pdf <local-file-name.pdf> --waitForJSEvent.
The html is hosted in S3 - https://s3-eu-west-1.amazonaws.com/generali-template-pregiotek/Generali+Template/index.html
This is actually an index.html file which references other pages and .css styles. This is why we used --waitForJSEvent. If the argument is not passed, then empty .pdf is generated. Maybe this is the reason for the delay. If so is there a way to speed up the process - either by passing additional arguments to electron-pdf or adjusting the way the .html is constructed?
Please advise.

Thank you for your time and consideration.

Best regards,
Mariyan