Blackburn manager Henning Berg hailed the scoring exploits of hat-trick hero Jordan Rhodes after a first win in the Rovers hotseat.
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The Scotland striker stole the show at London Road as Rovers jumped into the top six while sending their sorry hosts tumbling to the bottom of the npower Championship table on goal difference.
Mauro Formica opened the scoring before Rhodes took over the scoring duties with two before the interval and a third 11 minutes from time.
A delighted Berg said: "It was a fantastic feeling to see my team produce a performance like that.
"Crystal Palace had needed two very late goals to beat Peterborough and Brighton had to score in injury time to do it, so going in front so early was key.
"The difference between that display and our previous games was the quality of our play in the final third.
"We already know Jordan is a great finisher and he proved that again. He did brilliantly in League One last season and is already doing well in the Championship. Hopefully next season he will be in the Premier League with Blackburn.
"Providing we feed him with opportunities he will score lots of goals. It was a shame we conceded a late goal as that stopped it being a perfect day."
Substitute Morten Gamst Pedersen saw a fifth Rovers effort ruled out for offside before fellow replacement Nuno Gomes hit the post in the dying moments.
Those incidents sandwiched a consolation goal from Lee Tomlin, who stylishly converted a Kane Ferdinand pass with a couple of minutes remaining.
Despite suffering a heaviest home defeat of the season, Peterborough boss Darren Ferguson still found words of praise for his players.
Ferguson said: "We had started the game brightly so to concede such an early goal was a big blow, but I give credit to my players for not going under against a team with a hell of a lot of decent players.
"A lot of people might have thought Blackburn would go on to get five or six but we stuck to our task and kept looking for the ball.
"I really enjoyed watching some of our football and we got control of the midfield, but matches are won in both boxes.
"We now have away games at Ipswich and Charlton which will be key in our season."