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

Thu Apr 7 10:11:42 EDT 2011

I know, I know...

I was just wondering how I could make it less problematic for the user.

Thanks anyway.

Reegards,

Un saludo,

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David Alda Fernández de Lezea

Lurralde eta Biodibertsitate Saila / Dpto. de Territorio y Biodiversidad

IKT

Granja Modelo s/n · 01192 · Arkaute (Araba)

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Tlfnos.: 945-00-32-95                         Fax: 945-00.32.90
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email: dalda at ikt.es                                web: www.ikt.es <http://www.ikt.es/> 
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________________________________

De: openlayers-users-bounces at lists.osgeo.org [mailto:openlayers-users-bounces at lists.osgeo.org] En nombre de Slawomir Messner
Enviado el: jueves, 07 de abril de 2011 15:13
CC: openlayers-users at lists.osgeo.org
Asunto: Re: [OpenLayers-Users] Browser slow performancewhile parsingOpenLayers.Vector.Feature features

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.: 945-00-32-95                         Fax: 945-00.32.90
	··················································································
	email: 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> 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                                web: www.ikt.es
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	Zac Spitzer 
	Solution Architect / Director
	Ennoble Consultancy Australia
	http://www.ennoble.com.au
	http://zacster.blogspot.com
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