> On my machine the King James Bible epub file, 1.7MiB of compressed text, was converted in less than a second.

I took almost a second. Since we don’t know what your machine is, the statistic is irrelevant. What’s the harm in providing the model?

Meh, it provides info about some order of magnitude you can expect from performance. It doesn't take 10 seconds. It's not instant. It's fast enough to do on the fly.

Tired of using Python tools I rewrote epub bionic conversion is Rust.

Let me know if have some good ideas for features or integrations.

Do you think you could compile it to WASM and make it into a browser extension?

bionic reading: https://bionic-reading.com/br-method/