Pdf reader won't load heavily annotated pdf

edited April 6, 2021
I have a heavily annotated PDF which wreaks havoc in the PDF reader.
To be more precise: the first pages will load, but as soon as I scroll I get a blurred out pages with the loading icon, and the app freezes. Searching through the document is similarly impossible, and will cause the app to freeze.

I suspect it's not an issue of size (the PDF is a book, but just about 600KB), nor length (I have books that load smoothly), so the numerous annotations could be the culprit (but I don't know).
I can't get an error report (I get "No errors have been logged since Zotero started"), but after the app freezes I get this popup window (NB the number at the end changes every time):

"A script on this page may be busy, or it may have stopped responding. You can stop the script now, or you can continue to see if the script will complete. Script: resource://zotero/react-dom.js:23311"

I'm running the latest beta (15) on MacOS
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