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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