The proposed changes to the Canadian Environmental Assessment Act actually don't reduce the timelines. They actually provide timelines for the environmental assessment process, which is a significant benefit.
As an example, for comparison, the provincial environmental assessment process in British Columbia has legislated timelines that have been in effect since 1995. Those timelines include a 30-day review for the draft environmental assessment to make sure it meets the terms of reference for the project, a 180-day review period by the regulatory agencies, first nations, and affected local communities, and a 45-day ministerial approval time, so the province can get through the environmental assessment review process in 255 days. The federal government is giving itself 365 days to do what the province does in 180 days.
I think this demonstrates that the timelines here are generous and that they provide lots of opportunity for interdepartmental-like relationship-building and communication through the environmental assessment process.