[tjader]

It needs to rerender everything whenever you change any setting that affects typesetting. This used to be quite annoying when trying out fonts or find the best value for some setting, but recently they implemented a better way so that it first renders the current fragment (usually a chapter), releases the UI so that you can read, and renders the rest in the background. Page counts and some other stuff are broken in this meantime.

[taeric]

That better way makes a ton of sense, and is what I would expect to be default. Getting page numbers is a flex that just doesn't feel necessary. As I said, I would expect even faster renders if it did present content first. Would edge case into unstable page counts, but I struggle to care on that? Make it an optional setting, and be done with it. Especially as I prefer resizing to keep the current start of page I'm looking at. Something obviously not guaranteed in a resize.