This is more than theoretical. First rendering delays are noticeable on even 
moderately highend mobile devices. 

Attaching to an pre rendered DOM, optionally enhancing it, is a big win. 

It's not just something done in React. (I first saw it in a Backbone 
application if that helps date it.)

On the performance side, the "time to attach" a price worth paying. You serve a 
usable interface, you enhance it without a re-render, the pecieved performance 
is much faster. (And if you JavaScript fails to load you're still in business.)


I'm a big +1 on this. I'm happy to help test, or whatever else I can offer. 

Good one! 

Carlton  

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