Rotherham boss Steve Evans believes his side fired a warning to the rest of their npower League Two promotion rivals with the performance in the 1-0 win over Chesterfield.
The game was settled by the hosts' skipper Johnny Mullins in the 57th minute as he rose above a crowded goalmouth to head home David Noble's right-wing corner
"When we play like that, we are very, very hard to contain," said Evans after his first local derby at New York Stadium.
"As a manager, if every local derby is as one sided as that, I'll be happy.
"We produced a really good performance and that's against a Chesterfield team I have the highest regard for, but when our team play like that we are very, very hard to contain."
Chesterfield boss Paul Cook was an angry man at the end, readily admitting that his team "got away with murder" by only losing by the one goal.
"We could have been beaten a lot more," said Cook. "We just didn't turn up. The best team won, comfortably by far. It was an embarrassment because of how bad we were.
"Players need to stand up now and again and at our club they need to stand up. Everybody who comes to play for us comes with a responsibility.
"You can dress it up as a manager but the goal was coming. They were going to score and what we didn't want to do was wait for them to score to make changes. But whatever we were trying it wasn't good enough.
"Every credit to Rotherham. They were a handful from the start and it was pure luck that we went in at half-time on level terms."