New Zealand head coach Steve Hansen had mixed emotions after the 33-10 victory over Wales in Cardiff.
The All Blacks silenced the Millennium Stadium with a clinical first half that saw them move 23-0 ahead, and only the sin-binning of Cory Jane provided the hosts with any momentum whatsoever.
But Hansen believes better will be required when he takes his side to face England at Twickenham next weekend.
He said: "We put them under a lot of pressure but then of course got Cory (Jane) in the sin-bin (for a deliberate knock-on) and we lost our control and shape for some time - which allowed them to come running back at us.
"But we can't afford to get ahead of ourselves and if we don't prepare in genuine fashion England will give us a thumping next week. However, we'll enjoy this success and start again on Monday."
Hansen was coy on an ugly incident involving his hooker Andrew Hore early on in the clash.
Citing commissioner Mike Rafter is expected to take action after the visiting No 2 aimed a punch at Bradley Davies from behind - forcing the lock out of the game.
Hansen said: "I haven't seen it so I'm not going to get too carried away - but I saw him hooking Bradley Davies out of the way. How he did it we'll have to look at on the video."