SignedCms in VS.2005 is very slow, signed data is not compatible with CAPICOM 2

Hello, Did some body used VS 2005(c#) to sign data or verify signature functions ?
I tried sign a data and verify signature sample on MSDN (Signing a Message by One Signer ), it seems this sample is very slow, I used CAPICOM SignedData function to sign 10M string, it used 1 second on my computer, but SignedCms (convert to byte[]), it used 29 seconds.
also the signature I get from this function can not be verified (convert to base64 string) by CAPICOM. If I used CAPICOM signedData sign some data, SignedCms.CheckSignature can not verify signature from CAPICOM.

It seems that EnvolopedCms worked very good with CAPICOM, results are compatible.

[694 byte] By [jimmyshu] at [2008-2-7]