You haven't read the site, have you?
> If, however, a Tcpcrypt connection is successful and any attackers that exist are passive, then Tcpcrypt guarantees privacy.
> If, however, a Tcpcrypt connection is successful and any attackers that exist are passive, then Tcpcrypt guarantees privacy.
The point is that it is not a useful comparison to say that tcpcrypt is 36x faster than SSL, when it offers a weaker level of security.