Hi,

The Keccak Team wrote:

We have read your transition plan to move away from SHA-1 and noticed
your intent to use SHA3-256 as the new hash function in the new Git
repository format and protocol. Although this is a valid choice, we
think that the new SHA-3 standard proposes alternatives that may also be
interesting for your use cases.  As designers of the Keccak function
family, we thought we could jump in the mail thread and present these
alternatives.

I indeed had some reservations about SHA3-256's performance.  The main
hash function we had in mind to compare against is blake2bp-256.  This
overview of other functions to compare against should end up being
very helpful.

Thanks for this.  When I have more questions (which I most likely
will) I'll keep you posted.

Sincerely,
Jonathan