Since it uses React internally, I wonder how large these documents can grow until the experience gets sluggish. I ask this because React basically requires all of the internal content to be "visited" upon a redraw. But regardless of React, it is still interesting to know the constraints in terms of performance.

Also, instead of just pointing to the code on github, I'd like to get at least a little insight into the architecture of the project, because that is the interesting part, in my opinion. There is a brief description in the readme on github, but it doesn't really paint a clear picture.