Stevenage manager Gary Smith admitted his side had been outclassed after losing 4-0 to Swindon.
Goals from Matt Ritchie, Raffaele De Vita, Miles Storey and Adam Rooney inflicted a heaviest-ever Football League defeat on high-flying Boro - their first at home this season and their first at the Lamex Stadium since January 2.
Three goals came in an impressive first-half performance from Swindon in which the Robins might have scored more, with Tommy Miller having a penalty saved by home goalkeeper Steve Arnold.
"They started brighter than us, sharper than us and looked more of a goal threat. And there were far too many of our players who were below par, and Swindon took advantage of that," said Smith, whose side slipped out of the automatic promotion places with the defeat.
"I hoped the penalty save was going to galvanise a few of the guys into a little bit more of a performance, but in truth we never really got going. I have to give a hell of a lot of credit to Swindon for that. They pressed the ball well, they worked tirelessly to win it in that central area, and not many teams have been able to out-compete us.
"Their movement in their front two was good, they looked sharp, they linked up well, and a feature of their side was playing out wide, and they looked different class. All four goals came in open play, which is not something you normally see. I have to tip my hat to a very good Swindon side."