[Tilecache] Quick panning with overlays
yves.moisan at boreal-is.com
Wed Nov 26 09:37:35 EST 2008
> maybe the right question would be: And how many overlay layers do you
> have Yves?
> I remember one OL user was complaining about speed, and he had like 80
> layers :D Keeping it under 3 layers at a time should do the trick i
Well indeed that's an issue. I have 20 some overlays. I know it's too
much and a lot of those layers could be turned into composite layers
e.g. all line feeatures could be grouped in one layer with symbology,
but that means using a custom LayerSwitcher.
> People should take more care with number of layers. Instead of
> piling up the layers, one should group layers in wms request: you
> loose some speed on rendering it, but if you use caching its well
> worth it ;)
The overlays are not cached. I'm supposed to have a script that bundles
calls to MapServer somewhere. If you have pointers, I'll take them.
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