Fallout shelter: Updated room produce less than before

fallout-shelter

I'm new at Fallout Shelter and every time I create a new Vault, I have problem to get enough resource.
So, on my last game, I'm full focused on resources rooms. For each resource I have 2 merged room, updated one time and always full. On stat I had something like 9.5 Water production / minute, and when I have updated this room again I got 7.0 Water production / minute..
WT. ?! Which game give you a worth production when you update it?
I was full stock and now everyone is dead, cause I got no more caps (update cost 1125, all my save).

What do I have to do to grow up my production ??

Best Answer

Did you check your dweller stats? The higher the appropriate stat is, the faster the individuals in the room work. So take a water treatment plant. If your perception in the room is now lower than it was in your other room, the production time will be longer. You can fix early in the game by making your dweller wear outfits you collect to push the appropriate stat. Later, you can raise them using the training rooms.

On top of this, the happiness of your dwellers will all increase the amount of bonus resources you get.