Which SSH keys are the *fastest*?

It seems that no one talks about this, but I'm SSH'ing into a container in my machine, I have no security concerns. I really want to use as little math as possible. But I can't seem to find which key types are actually the fastest.

Seems like a reasonable question? Or is that only for auth and another encryption is used for the connection?

The key should be only for auth. Test: pull the Yubikey that hosts it and your connection is still alive.
The really fast (insecure) connection encryptions are disabled in modern OpenSSH though.

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