Flux architecture in a KnockoutJS project

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The Flux architecture looks really good and I would like to use it in my next project.

The problem that I see right now is.....for every Store-Changed event that I get, I need to update every Component ViewModel that is using that store.

Let say store we have these 2 stores

Store Users(500 users)

Store messages(5000 messages)

And a viewModel called Top5UserMessages of a given user. 

Those 2 stores can trigger a lot of events. How can I handle keeping my ViewModel up to date, efficiently?