[OpenLayers-Users] Browser slow performance while parsingOpenLayers.Vector.Feature features

[Slawomir Messner]

Hi,
it's impossible that a pedal car is nearly as fast as a f1 car and take 
as much as a truck. My opinion is that either you force your customer to 
use safe and fast browsers or you have to reduce the load by minimum of 
polygons drawn or switch to a desktop prog like QuantumGIS. Minimize the 
number of geometries by a strategy, if you want to edit them then 
cluster is not an alternative. If you pass attributes with your features 
then you can leave them out and load them later, if you need them. I 
don't know if it helps and this is not a standardized solution, if you 
minimize your data to the less verbose format, I think it's WKT or a 
custom json, and write your own update Serversidewhatever. Simply a 
simple format to parse for the browser with minimum of memory 
consumption. But I think, it will be much work for at best little more 
performance.
We must also always say our users to switch to a new browser if they 
want to have the functionality and speed("Sry, there is a minimum 
requirement. It's free, ask/force your admin to install it."). In the 
end there is no workaround you can only cut things out. You never will 
have a performance like chrome or ff out of a bad engine. Think about 
how much seconds you spend to get a second less for users.
I know there is no solution for your performance problem but maybe an 
argument for your customers.
Best regards
Slawomir

Am 07.04.2011 14:21, schrieb David Alda Fernandez de Lezea:
> Zac,
> thanks for your response. I know IE sux, but 95% of our customers have 
> IE6 installed, and they are not allowed to switch to another version 
> or to get other browsers.
> I get the polygons from GeoServer from a wfs layer. They are complex 
> polygons with lots of vertices (parcels from cadastre) and I can't 
> simplify the features because we are on the task of online editing 
> using wfs-t protocol, so the edition must be accurate.
> I'm just wondering if there is something that I can show, like a 
> progress bar or loading image, to tell the user this kind of 
> operations will take a bit, but I'm afraid is going to be difficult 
> because of the browser program.
> Any idea?
> Regards,
>
> Un saludo,
>
> ··················································································
>
> *David Alda Fernández de Lezea*
>
> Lurralde eta Biodibertsitate Saila / Dpto. de Territorio y Biodiversidad
>
> *IKT*
>
> Granja Modelo s/n · 01192 · Arkaute (Araba)
>
>
> ··················································································
> Tlfnos.: 945-00-32-95Fax: 945-00.32.90
> ··················································································
> email: dalda at ikt.es 
> <mailto:dalda at ikt.es>                                web: www.ikt.es 
> <http://www.ikt.es/>
> ··················································································
>
>
> ------------------------------------------------------------------------
> *De:* openlayers-users-bounces at lists.osgeo.org 
> [mailto:openlayers-users-bounces at lists.osgeo.org] *En nombre de *Zac 
> Spitzer
> *Enviado el:* jueves, 07 de abril de 2011 13:33
> *Para:* openlayers-users at lists.osgeo.org
> *Asunto:* Re: [OpenLayers-Users] Browser slow performance while 
> parsingOpenLayers.Vector.Feature features
>
> short answer, IE just sucks
>
> long answer, you could switch over to a real mapserver engine
>
> how dense are your polygons? generalising them might help a bit if 
> they are very dense
>
> On Thu, Apr 7, 2011 at 9:29 PM, David Alda Fernandez de Lezea 
> <dalda at ikt.es <mailto:dalda at ikt.es>> wrote:
>
>     Hi list,
>
>     I'm having some performance issues with most browsers, but
>     specially with IE (this is the real problem).I have a vector layer
>     in which once the map is shown I load from 50 to 100 polygons and
>     I zoom to them. I know that this is a task it will consume some
>     time, but the problem is that the browser gets freezed and I would
>     like to improve that in order to improve the user experience.
>
>     I've tried this in
>
>     FF --> 5-10 seconds
>     Safari --> 5 seconds
>     Chrome --> 5 seconds
>     Opera --> 5 seconds
>     IE6 --> 60 seconds
>     IE7 --> 40 seconds
>     IE8 --> 30 seconds
>
>     Is there something that I can do to improve the browser's response??
>
>     Thanks.
>
>     Un saludo,
>
>     ··················································································
>
>     David Alda Fernández de Lezea
>     Lurralde eta Biodibertsitate Saila / Dpto. de Territorio y
>     Biodiversidad
>
>     IKT
>     Granja Modelo s/n · 01192 · Arkaute (Araba)
>
>     ··················································································
>     Tlfnos.: 945-00-32-95                         Fax: 945-00.32.90
>     ··················································································
>     email: dalda at ikt.es <mailto:dalda at ikt.es>                        
>            web: www.ikt.es <http://www.ikt.es>
>     ··················································································
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>
>
>
> -- 
> Zac Spitzer
> Solution Architect / Director
> Ennoble Consultancy Australia
> http://www.ennoble.com.au
> http://zacster.blogspot.com
> +61 405 847 168
>
>
>
>
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