I don't know why you guys are surprised that the Habs suck in the first period. It is crystal clear that this team has given up on our moronic coaching staff.
This is like when you work and you have a crappy supervisor, you do the minimum to keep your job. You don't go the extra mile since that crappy supervisor will get all the credit.
Same thing the Habs players are doing, minimum work, just give a little extra effort in the second and third period to keep their place in the lineup. The players are patient, they know they will outlast Therrien. Besides, they have guaranteed contracts, no need to rush.