[OpenLayers-Users] Performance of different layers

[Tim Schaub]

Rahn Hanno (rahn) wrote:
> Hello,
> 
> This helps, Thank you Bryan. But can you give me some details about
> the performance? Do you think it will be better to use an WMS Service
> with UMN or Geoserver or so, or is it better to show kml, gml,
> geojson. If I use this I don't need a Mapserver , right? But do you
> think it will be much faster to "build and show" the map in the
> browser with this version?
> 

I wouldn't guess the OpenLayers list would be the best place to learn 
about WMS performance, but you can try Google:

http://www.google.com/search?q=wms+shootout

OpenLayers is typically a tile based map client - requesting many small 
tiles and stitching them together.  The WMS specification was not really 
put together with this in mind, and WMS servers have to do a whole lot 
of work to support a greedy tile based client.

Your best bet is to pre-render your data, cache the results, and serve 
those cached tiles.  This will always be faster than asking your WMS to 
dynamically render tiles with every request.

Where you have dynamic data that doesn't work well with caching, use 
larger tile sizes (or singleTile: true) and set buffer to 0 on your WMS 
layer.

Tim

> Thank you Greetings Hanno Rahn
> 
> ------------------------------------------ Hanno Rahn, Dipl.-Ing.
> (FH) Geoinformatik ZHAW Zürcher Hochschule für Angewandte
> Wissenschaften Umwelt und Natürliche Ressourcen Fachstelle
> Geoinformatik Grüental, Postfach CH-8820 Wädenswil Tel +41 (0)58 934
> 5592 Fax +41 (0)58 934 5580 hanno.rahn at zhaw.ch 
> www.iunr.zhaw.ch/geoinformatik
> 
> 
> 
> 
> 
> 
> 
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-- 
Tim Schaub
OpenGeo - http://opengeo.org
Expert service straight from the developers.