Arsene Wenger savored Arsenal's finest performance of the season after Porto were crushed in the Champions League last night.
The rout dispelled the gloom that had descended over the Emirates Stadium since Saturday's humbling defeat by Barclays Premier League newcomers Hull.
Robin van Persie registered his first goals in European competition for a year when he fired a well-taken brace while strike partner Emmanuel Adebayor also scored twice.
The Togo marksman's second was from the spot after Nicklas Bendtner had been hacked down clumsily by Freddy Guarin.
Arsenal top Group G and Wenger expects his team to qualify for the knockout stages - but also demanded a return to winning ways on the domestic front.
"The most important thing was to respond quickly in a convincing way to the game against Hull and that's what we did," he said.
"We were focused and I was happy with the attitude. Maybe we were too tense at the start of the game but we were focused and at this level that is vital.
"It's difficult to measure our best performance of the season but this was maybe our most complete performance.
"This is half the response I want. The other half comes on Saturday against Sunderland. I expect to win the group after this."
Wenger was delighted with the contribution of Cesc Fabregas and Theo Walcott, who caught the eye with a string of marauding runs down the right wing.
"I thought Fabregas was outstanding. He was good offensively and defensively. It was a complete performance," Wenger said.
"Theo was dangerous again and is always improving."
Wenger had threatened to overhaul his team in response to the defeat by Hull, but in the end just replaced Emmanuel Eboue with Samir Nasri.
"I was tempted to make more than one change but I didn't want to give the feeling that I was punishing one player more than another," he said.
"I wanted to give the team the chance to respond quickly. The change was not to punish anyone, it was because we needed to respond quickly as a team."
Porto coach Jesualdo Ferreira felt the match would have taken a different course had his side capitalized on a couple of early chances.
"When Arsenal had scored their first goal we'd already had two chances that we didn't make the most of," he said.
"We looked more dangerous than them early on."
