New Zealand coach Steve Hansen has spoken of his irritation at the continuous stopping during the second half against Namibia on Thursday.

The All Blacks saw off a feisty Namibia side 58-14 but were made to work for the result, especially in the third quarter of the game.

"It was frustrating," Hansen told reporters afterwards. "In the second half there was about 14 minutes of the game being played so it is very hard to play rugby when it's stop-start like that.

"We have got to deal with it better than we did tonight anyway. It is difficult when every time you have a scrum. I think at one stage there we spent about four minutes [on a scrum] and that's not what the game wants. I don't know how to fix it.

"That is what happens sometimes when you get opposition who are struggling to stay up and we are struggling to stay up and the game doesn't need it."

The TMO has been a major talking point so far during this World Cup, with many fans believing that there is an over-reliance on it.