Owls defender Tom Lees was left disappointed following the 1-1 draw with Charlton on Saturday.
Wednesday edged in front through dangerman Royston Drenthe but were pegged back after the interval.
Given the Owls’ first half dominance, Lees feels the Owls let two points slip at The Valley, where Charlton remain undefeated.
He told swfc.co.uk: “I think in the first half we could have been three or four up and that’s what we need to do; kill off games when we are in front.
“We didn’t seem to do that and going in 1-0 up at half time gave them a chance to come out stronger after a roasting at half time.
“That’s what they did and second half I thought we were disappointing. For me, it’s two points dropped.”
Wednesday have little time to let the dust settle on The Valley point and face a huge test at Hillsborough on Tuesday with Championship form side Bournemouth in town.
“We have to capitalise when we are on top,” Lees continued. “So many times you see it in football where you miss chances and know they will come back to bite you.
“When you think of all the hard work that goes into getting three points from three draws, you can do that in one day.
“But we have only been beaten in the league three times which is positive and now we have two big games at home coming up.”