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Docs: mention performance reasons for reusing RSAPrivateKey when encoding #734

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3 changes: 3 additions & 0 deletions docs/usage.rst
Expand Up @@ -45,6 +45,9 @@ If your private key needs a passphrase, you need to pass in a ``PrivateKey`` obj
)
encoded = jwt.encode({"some": "payload"}, private_key, algorithm="RS256")

If you are repeatedly encoding with the same private key, reusing the same
``RSAPrivateKey`` also has performance benefits because it avoids the
CPU-intensive ``RSA_check_key`` primality test.

Specifying Additional Headers
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