Hi all, Thanks Gregor, Stephen and Eric for your answers. I will investigate further with your advices.
Many thanks! :) Marc Stephen Woodbridge wrote: > Eric Lemoine wrote: >> On 8/6/07, Marc Desharnais <[EMAIL PROTECTED]> wrote: >>> Hi all, >>> >>> I don't know if it's normal, but my page using 7 layers is really slow. >>> I have to mention that the layers are not all activated. Only 2 of them >>> are shown of on the map. >>> >>> Initial loading takes up to 30 seconds. Zooming to a particular area : >>> 10 seconds. >>> And the CPU consumption of my workstation jumps up to 80% when loading >>> times. Is this normal? >>> Logically the workstation should not work really hard since it is >>> querying some PNGs... Am I wrong? >>> >>> No server is on my workstation. The server and all the data used in the >>> layers is on LAN. >>> >>> 6 layers are colored points and one is a shapefile converted to >>> postgis. >>> >>> What is slowing down the process? >> >> Hi Marc, >> >> Seven layers is a lot of layers, and is probably what kills you here. >> Can't you merge your layers to reduce the number of layers in >> OpenLayers? > > Marc, > > Depending on the type of layer you are using, this might make 7 image > requests if you are not using tiles and if these are all going back to > the same server then they will pretty much get serialized unless you > play some DNS tricks to give the server multiple CNAMES. > > If you are using tiles, you might be loading 9-25 tiles for each layer > times 7 layers and the same issues I mentioned above would apply. > > This is why Mark has suggested combining layers into a single request > if your user model will allow for that. > > You can use Foxfire and FireBug to monitor the time to load the > various images and this will give you a better idea of where the time > is getting spent. You should also watch the server and see if it is > the bottle neck and how many requests is is getting and processing. > > Hope this explains your issue a little better. > > -Steve W _______________________________________________ Users mailing list [email protected] http://openlayers.org/mailman/listinfo/users
