I think it's from two directions, below and above.
From below, the pressures that are being faced by municipalities, by neighbourhoods and by all Canadians are well known, I'm sure, to the people in the IRB. I'm not a mind reader, but I would expect that they are sensitive to those pressures and they're trying to speed up.
From above, no doubt, there's political pressure to make the system work better, and I can't blame anybody for wanting such an outcome. It's natural that the IRB members will feel that they have to push harder, and it's an easy-to-predict risk that they'll push too hard.