My experience in developing and maintaining Fossil is that the hashing speed is not a factor, unless you are checking in huge JPEGs or MP3s or something. And even then, the relative performance of the various hash algorithms is not enough to worry about.
Thanks for the insight. My intuition was kind of the same, but on modern hardware computing the digest-style (as opposed to cryptographic, slow-by-design) hash is essentially imperceptible for payloads in the low MBs -- and much above that is a use case for LFS.
