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I keep seeing "EdDSA is faster than RSA" but is it ever usefully faster? I imagine it's maybe milliseconds of difference per secure connection initialization, and so it feels deceptive to market it as (usefully) faster.
(2016)
And OpenWRT dropbear only just recently got ed25519 support at mainline. Not in a release yet.

I bumped into this recently when I replaced my older rsa hardware keys with newer models. Switched to openssh for now.

On Windows use PuTTY at own risk in 2021. It was an important tool two decades ago, but its time has sunset.

Windows 10 has "real" OpenSSH client available as a built-in feature (and server available as an optional feature). Use Windows Terminal (or ConEmu/Cmder, per preference) for the terminal experience upgrades PuTTY used to provide.

I use PuTTY because I'm used to it, and I use a ed25519 key with it without any issues.
Is there a way to make Ctrl+Space work with Windows Terminal? I recall it is converted to another key sequence by Windows before getting sent to the other side.