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Proportional symbols with pre-generated centroids
In this case, I made the centroids in CartoDB:
Then the D3 map loads much quicker:
http://bl.ocks.org/almccon/461d610e94d12d0a3cca8e530d3b03cd
![proportional_circles](https://cloud.githubusercontent.com/assets/1212178/16715592/519aeb4c-4699-11e6-89a3-e73efba4634a.png)