Hi there. We are also having this same rendering issue being reported by customers. I believe this issue is also the same as this issue (2185): Text Rendering Issues in Chrome and Edge
The suggested solution in 2185 is not an acceptable solution as it requires end users to modify their Chrome settings, which is significantly outside our control (and possibly not even allowed by many corporate users).
Further reading suggests this issue is a Chrome (and therefore Edge) issue caused by a Chrome update last year and occurs in those two browsers but only with a specific built-in video cards.
This thread in support for react-pdf is a good summary of the issue. It also has a proper solution for that software from just a few weeks ago: PDFs not rendering perfectly after Chrome update · Issue #1010 · wojtekmaj/react-pdf · GitHub
The Chrome bug issue can be found here: 1404710 - chromium - An open-source project to help move the web forward. - Monorail
The last update to PDF.js Express is 6 months ago and the changelog does not seem to mention this issue or fix. Is there a planned update for PDF.js Express with a similar and proper solution to this issue? I fear it is pretty widespread in corporate environments which often use built-in video cards.
Thanks.