Yes I thought of that but my method allows us to drive down latencies significantly, while keeping costs about the same overall. If we want to get them as low as possible though, as you say we could still benefit from having two copies. Not only do we get greater concurrency, we also can skip the step where we flip all the pages - so it's even better than twice as fast, actually.

We could even get the best of both worlds by laying the pages out on a clear surface, putting a camera on the other side, and hooking one of my eyes up to a feed of that camera. That would require some custom hardware and a little more up-front cost, though. We can look into whether that's cheaper than just buying another book.

Either method is a huge improvement on this "read two pages at a time" business, in any case.