Pellegrini's men bounced back from last weekend's last-gasp defeat to Chelsea in style, registering their largest Premier League victory ever to maintain their 100 per cent home domestic record this season.
There were six different City scorers against the beleaguered Canaries, who could not live with the home side's attacking quality.
Aguero and David Silva were at their unplayable best and Pellegrini praised the ruthlessness of his players, who did not let up despite taking a 4-0 lead into half-time.
"We played really well. We didn't give any chance to Norwich and we scored seven goals so I'm very happy," he said.
"I don't think it's the best (performance this season). I never compare with another game but this was very, very good.
"It was important to keep a clean sheet and it's very important that the team plays exactly the same way, dependent (sic) on the score.
"Kun Aguero is one of the best three orfour players in the world and he must demonstrate this every game. He must continue working all game because with his quality he'll have a lot of options (to score more)."