Comment by diarrhea

I’m curious about the async aspect of this. I was under the impression PDF processing like OCR is purely CPU bound. OS file I/O interfaces are sync, so async does not help. With GIL, so single threaded Python, I can’t see how async improves performance for the PDF use case. Only parallelism helps, and concurrency doesn’t. When would it yield back to the event loop when it’s busy number crunching?