Hi Christophe.

In NG2 you have a very fine-grained control over the change detection. You 
can make a top-level component that decides on the fly if it's entire 
subtree needs to be refreshed or not. The components in this subtree can be 
completely unaware of this.
Then there is this: The decision when something needs rendering (usually 
because we suspect performance issues!) is pure business logic. That is 
something that should NOT be in the template to begin with..

Regards
Sander 

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