Despite the apparent ease of the win, Commons said Celtic had their defence to thank, in particular goalkeeper Fraser Forster, who pulled off some remarkable saves to make it nine matches since they conceded in Scotland's top flight.
"It was a good performance. I think in the first half we were a bit lacklustre," Commons, who now has 16 league goals this season, told Sky Sports 1.
"Obviously a change of formation and personnel just gave us that extra edge up front and I'm pleased with Virgil getting his goal and for Teemu as well as it made the difference when he came on.
"Each week it's going to get harder and harder.
"The boys at the back deserve and (goalkeeper) Fraser Forster deserve a massive credit today.
"There were some world-class saves from Fraser and he kept a clean sheet and we kept the winning streak going so it's going to get harder every time but hopefully we'll maintain it."
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