Probably relevant: https://news.ycombinator.com/item?id=26145584
> Arxiv PDFs are easy to read only if you crop or zoom
Have you tried another PDF reader, like KOReader[0] or plato[1]? There's also [2] which looks really interesting for cases where you want to save time.
[0]: https://github.com/koreader/koreader
[1]: https://github.com/darvin/plato
[2]: https://github.com/GjjvdBurg/paper2remarkable