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Public key performance - to improve performance often the 2 methods are combined, the public key is used to encrypt the secret key which is used to encrypt the bulk of the msg. This is called using a digital envelope.
Secret keys are ideal for encrypting your own files.
In practice, RSA is almost always combined with DES (or other) to encrypt a msg by means of a RSA digital envelope. RSA is a de-facto std, the patent expires in 2000.