Chris Robshaw says that England must start better if they are to be successful against Australia, South Africa and New Zealand in the wake of Saturday's win over Fiji.
Fiji dominated the early stages at Twickenham, keeping the majority of possession and threatening the England try line on multiple occasions before the hosts took control.
"We were pretty slow coming out of the blocks. We eventually warmed into the game but we cannot do that over the next three weeks," said Robshaw.
"Next week and the week after and the week after that we are going to have to be more clinical."
Man of the match Alex Goode agreed with Robshaw's sentiments, with the Saracens full-back impressing on his first start at Twickenham ahead of Mike Brown.
"At the start we were a bit scrappy and there were a few errors," said Goode.
"I thought when we hung on to the ball we created some good stuff."