"I think even the training week, being back with the team, it's a bit of a step up. But I got through it and it's good to get this out of the way and obviously build on that."
New Zealand will spend this week in Dunedin as they continue to search for the magic tonic to get their high-octane style of play to click.
They've played six tests this year, including three in the Rugby Championship, and while they're unbeaten, the two victories against Australia and Saturday night's triumph have been scratchy.
"There was a lot of frustration and we are aware that we are still not playing as well as we'd like so I'd be more concerned if we were really happy," Smith said.
"We know we can play a lot better and, hopefully, there's a lot of tests for us left in the year to try and do that."
Despite the scoreline suggesting New Zealand cruised against the Pumas, Smith said the South Americans would provide a stern test for Australia this weekend.
"I think Argentina will get a few scalps. I thought that right from the start. Obviously at home everyone has a lot of trouble putting them away and I think they showed they can travel really well also. So they will be tough for the Wallabies to beat."
South Africa arrived in New Zealand today and will travel to Dunedin on Thursday.