CNG is slow?

Not quite sure why, but CNG (Cryptography-Next-Generation) is considerably slower than good old RSACryptoServiceProvider:

Method KeySize Mean Error StdDev
RSAEncrypt 512 7.304 μs 7.521 μs 0.4122 μs
RSADecrypt 512 31.200 μs 3.130 μs 0.1715 μs
RSACngEncrypt 512 142.589 μs 8.738 μs 0.4790 μs
RSACngDecrypt 512 184.463 μs 36.394 μs 1.9949 μs

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