Hey again,
I tried investigating but I could not reproduce the problem. I tested PDF.js Express Viewer 8.4 on Safari with many different documents (some as large as 10,000 pages) and I didn’t have any memory issues. I suspect this is either document specific or device specific.
I will need more details or a better way to reproduce in order to help at the moment. If you could isolate the problem to a document or a set of documents that would be very useful too.
Thanks,
Logan