Benchmarking example:
https://anarc.at/blog/2017-10-26-comparison-cryptographic-keycards/
Seems to show some quite slow times for RSA4096 on the NitroKey Pro - but it is from 2017, so there may have been improvements made in the NK3.
As an added note, the main focus of the threat model here is someone breaking into the machine over the net and stealing the keys out of ~/.ssh/, not a nation state actor going ham.
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