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Huh, it’s not every day that an LLM suggests on the issue tracker a low-hanging fruit change that saves 30% on X25519 handshakes. We already had a much faster edwards25519 fixed-base scalar mult, which can be used for half of ECDH with a small mapping. (The other half of X25519 is “special.”) https:// go-review.googlesource.com/c/g o/+/814601