There doesn't seem to be much up-take in my question so maybe I should 
re-phrase:

I'm using precooked colored kml layers (red, orange, yellow, green, blue, 
indigo, violet) because parsing the polygon data on the browser would take 
forever
the polygon data is approx 30 MB in total.

This has the limitation that we can't dynamically color-code the polygons. 
We can't dynamically change the balloon text. 

Maybe if the polygon data were much smaller eg 60 KB it would be possible to 
handle client side using eg geoxml3 

My question is: has anyone else taken the approach of predefining a limited 
set of colored kml layers and rendering reports with this set of regions?

Or would an alternative be to simplify the polygon shapes such that they are 
much smaller and handle client side with the advantage of changing the 
balloon text on the fly?

I am interested to hear what existing successful projects have done

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