There were six minutes added on to the end of each half by referee Ben Toner at a packed Fratton Park.
After taking an early lead through Josh Windass’ neat finish, Sheffield Wednesday were not exactly in a rush for the rest of the game.
The visitors looked to slow things down as much as possible and were ultimately able to hold on to claim all three points.
Joe Rafferty understood why the Owls adopted those measures, but felt more could have been done to hurry things up.
The defender said: “We always knew it was going to be a tough game and Sheffield Wednesday are top of the league for a reason.
“But I don’t think we were outplayed by them and it was just that when they got their goal, it was quite difficult because they’re an organised side.
"I was constantly at the referee to try to get the ball back into play and just to try to hurry things up a bit more."
“They’re good at closing games out and have got experienced players who were able to manage things well.
“I was constantly at the referee to try to get the ball back into play and just to try to hurry things up a bit more.
“They were able to run the clock down at the end and fair play to them because it’s good game management.
“I thought that we did quite well overall, although we probably could have created a few more chances.”
Despite the loss, Pompey looked bright for long periods against the in-form League One leaders and Rafferty is happy with how they are performing under John Mousinho.
He said: “The new manager has simplified everything and introduced a few new ideas. I think it’s worked for the lads so far.”