In the spring of 2024, while brute-forcing mnemonics, I took a look at improving the performance of embit.bip39.mnemonic_to_bytes(), which is:
- well peer-reviewed
- tested... arguably enough
- stable and in-use by a number of projects
I ended up re-implementing this function using a big-integer accumulator. I call the branch "bip39_via_accumulator".