[OpenLayers-Users] change layer style on zooming

[Phil Scadden]

If you are processing thousands of features, then it would be far better 
to have that layer on a server and using WMS to display rather than 
fetching a geoJSON which will be slow to fetch, slow to process. With 
WMS, you can build an SLD with zoom-based rules for styling or using 
functions to set size.

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