CChecksum is an ~18x faster drop-in replacement for eth_utils.to_checksum_address, with the most cpu-intensive part implemented in C.
It keeps the exact same API as the existing implementation, exceptions and all.
Just pip install cchecksum, drop it in, and run your script with a substantial speed improvement.
Supported Python versions: CPython 3.9 through 3.14. For full distribution-by-version coverage, see DISTRIBUTIONS.md.
(note to self: update that screenshot, its way old)