The 24-year-old was again among the Swans' best with 28 hit-outs, 15 possessions, five clearances and a goal in the club's eight-point victory over the Western Bulldogs at Manuka Oval on Saturday.
Mumford has already eclipsed his goalkicking tally of four goals in 21 games last year and is quickly becoming one of the game's most damaging ruckmen.
Mumford attributes his improvement this year to the new substitute rule which made him develop another side to his game.
"In a way you've got to add a few more strings to your bow, you can't just be the one trick pony now as a ruckman," Mumford said.
"I think it [the substitute rule] is a great thing, I guess not everyone is of the same opinion but I'm pretty happy with the way it's going at the moment.
"I'm really enjoying the new role being able to go forward. It was something I wanted to work on this year and spending more gametime out there you can have a bit more impact on the game."
Mumford said the Swans' victory over the Bulldogs, which ended a three-game losing streak, may be the catalyst the club needs to get their season back on track.
"Hopefully it's the turning point in the start of our upward spiral for the rest of the season," he said.
"We really needed to get back on the winners' list and we fought hard to do that."
Swans coach John Longmire said Mumford is the type of player every coach loves to have in their side.
"Shane Mumford, you know what you are going to get every week," Longmire said.
"He's consistent with his effort and just gives effort every week and tries his hardest. I know it sounds simplistic but it's a lovely quality to have is when you try your hardest."
The Swans now take on Port Adelaide at the SCG next Saturday night.
Mumford said the club will be looking to record their first victory at the ground this year.
"It's something we've been missing [winning games at the SCG], the boys will definitely be well and truly up so hopefully we get a nice big crowd to get behind us and get a win on the board at home."
