Glasgow head coach Gregor Townsend knows his side cannot afford another slow start when they host in-form Exeter this Sunday.
The Warriors did well to claim a bonus point after falling 34-0 behind to Toulon in their Heineken Cup opener last weekend, running in four second-half tries in a 51-28 defeat.
In contrast, Exeter cruised to a 44-29 win over Cardiff, and former Scotland international Townsend was impressed with the manner of their victory.
"Last week they were outstanding, some of the best rugby I have seen from an English side," Townsend said.
"They were 41-3 up after 50 minutes. They are a very well-drilled side, they know what their game is about. They run the ball more than any other team in England.
"They remind me a lot of Leinster last year. They are very good on the breakdown, they will keep ball and put you under pressure.
"So we have to be switched on defensively, we know we might not get that much ball so we have to make our defence a weapon for us so that we can get the ball back and run with it."
Townsend has urged his players to learn from their defeat to the defending champions, warning that they need to lift their game to compete at this level.
"We learned a great deal last weekend in Toulon, about ourselves and the level of rugby we face in this competition," he added.
"We had gone into the match full of confidence but we were way off our best in the first half.
"The display from our players after half-time was excellent but there is still an underlying feeling in our group of frustration and determination to put things right.
"It is very important that we rise up and deliver an 80-minute performance on Sunday."