It is CPU-based. Somewhere between 1 to 2 seconds per page on a single core. I ran 20 instances of it in parallel to utilize 20 CPU cores so the avg time came down nicely.
That's actually amazing, and might give me a way to use all the cores I have lying around. 2s per page is an insane 600 pages per minute at 20 cores!
Please do open source it, even if you don't do much around it (worst case I can just spend a few million tokens trying to get opus 4.6 to get it to work)