It was supersonic in a dive
It also had aerodynamic weaknesses - the first prototype had a tailplane problem which lead to both wings clapping hands and all where lost in the following crash
What killed it after a fair few were built , but not put in to service, was not only polaris but the supercarrier ( nimitz class ?) programme and the fact the bomb bay doors sealong system was not massively reliable.
Cool programme none the less