Slow loading for large document

Hello,

We’ve noticed that a PDF file (around 20 MB) is loading very slowly:
https://www.doitsquare.com/es/qrcodes/71613da0-fe06-4c15-8327-951ce0c9fecf/pdf

The loading performance is even worse on mobile devices.

Is there any solution or optimization we could apply to improve the loading speed?

Thank you