We want to enforce good security by default for our users. That is why it is a fundamental assumption of Tails to force all outgoing traffic to anonymity networks such as Tor.
Virtual Private Networks (VPNs) could be faster than Tor but they are not anonymity networks, because the administrators of the VPN can know both where you are connecting from and where you are connecting to and break your anonymity. Tor provides anonymity by making it impossible for a single point in the network to know both the origin and the destination of a connection.
