> Is is therefore unreasonable to think about an OL-Client which uses an areal
> photo as background to display the cadastre on top?
> Cadastre-features are mostly simple but there can be many of them.
I put vast no. of features over top of photos or google layers but using 
WMS so the server does the rendering not the client. On top of this, a 
caching server (eg GWC in geoserver) can deliver even more speed and do 
generalisation of features on the fly as well. Its just not a good way 
to use WFS. Use WFS for query, and WMS for display. Have a look at 
SLDSelect example as well as way of doing queries with WMS.


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