[OpenLayers-Users] zoomed out view is wms and zoomed in is wfs

[Phil Scadden]

> One reason, for us anyway: In modern browsers retrieving the features once
> makes display much quicker than making network requests all the time for
> png/jpg imagery - particularly with many layers / tiles.
>
> Unfortunately "modern browsers" doesn't include IE8......
Well, this is only true when the total feature count is below a certain 
critical level. Downloading a mass of vector geometry is slow even on 
latest Chrome.
Even point layers have a limit but it is especially problematic for 
dense line topographies.

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