Well it depends on what you mean by 'faster'. If two players of reasonable skill went up against each other, I would say that there are more options and possibilities due to the bigger board.

It is hard to define faster or slower, but if you are talking about pawns being promoted into Pieces, then it is a lot harder to keep track of everything going around the [larger] board.

I would say the game would seem faster if an expert was taking apart a beginner, but then that happens in chess too.

So no I wouldn't say that Gothic is faster than regular. Maybe more complicated, but certainly not faster [as a rule] because chess isn't about speed and we cannot define a short checkmate as being better than a prolonged checkmate.