RSA? PoV?

Okay, I use the RSA CryptoProvider (Namespace: System.Security.Cryptography ): it works fine, but why does this class always create a new key, though it's completely unnecessery, because I always provide a key in a XML string, which I have created some time before? Mono doesn't, so it's much faster, because it doesn't have to create a new key for fun everytime you use RSA.

Regards, Max
PS: You must imagine how long it takes to create a RSA key with 4096 bits!

I think this may be part of the requirements of being FIPS compliant...ie that a key will never be reused, and that the system relies on only internally generated entropy when producing new keying material.