[OpenLayers-Dev] Problem loading layers

Robert Sanson SansonR at asurequality.com
Wed Jan 20 21:09:10 EST 2010

70+ layers seems a lot to load. Do you need all of them at  the same time? I would suggest grouping them. For instance in one of my applications I load land parcels + roads + address points as a single layer - in my case they are never edited, so I request them as a single WMS call to Mapserver.
You might be able to set up some buttons on your page, that load / unload groups of layers using OL's javascript functions such as map.addLayer() and layerRef.destroy()

>>> jtcrash <jacob_trainer at hotmail.com> 21/01/2010 2:13 p.m. >>>

Hi all,

   I am trying to load 70+ vector layers into OL and it seems to take a long
while even without any data being inserted into these layers. It takes
roughly 9 seconds to load the 70+ layers. Is this normal? Is there a better
way to do this as I am at a loss. In chrome everything seems to load
quickly, but in firefox there is a considerable lag time, it also seems to
force the browser not to respond for 3 or 4 seconds. of course IE is just
terrible and never worked well there. I am also adding a large number of
features across these layers, it seems the more and more i look at it the
answer seems to be a feature sever, is this wise? will this load 1500 points
into these 70+ layers more easily?

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