Omega manage to pump a fair ffew games out :p
Call of Duty hetc have multiple developers wokrking on different games to bring one our yearly. However, I think each Cod nos has 2-3 years of development time while the other studios put theirs out.
Assassins Creed Ubi just threw alltheir studios at different parts of the game to get the development completed.
So its no so much that Japanese developers are slower. It's that Western publishers are using different strategies.








