"It was only meant to be a light session but, after the cup draw paired us with Chelsea, there was a real buzz about the place," said Jones.
"The training was really high tempo with great movement and we have carried it on tonight.
"Our running off the ball and passing was first class. Virtually everything we hit went in but we could even have had a couple more goals.
"I know I have players capable of scoring in every game. But we also defended strongly throughout and all departments of the team deserve credit.
"I think I may have had a couple of similar wins when I was at Stockport. But it's more the way we played than the size of the victory that pleases me."
Bristol City boss Gary Johnson was shellshocked.
"It's the sort of night when it is best not to say much," he said. "Whatever reason I try to offer for that performance will be picked apart.
"We have a lot of soul searching to do over the next few days before our next game at Middlesbrough.
"It wasn't that we forgot how to defend, we just couldn't defend on the night. Full credit to Cardiff. I had my say at half-time but now we have to collect our thoughts and come up with the right response."