[OpenLayers-Users] WFS Layers blocks excution?

[Stephen Woodbridge]

Isn't Tim or someone else working on GeoJSON to give an alternative to 
WFS that does not have the XML parsing and overhead? I would think that 
this might be a good alternative. If this is really happening, then we 
might want to ping the mapserver list about support GeoJSON in the 5.0 
release.

-Steve W

Jackey Cheung wrote:
> I've been using Firebug for some time, and do tracked OL with FB. The most 
> time consumer is XML process on the FireFox. And I've done the same thing in 
> IE with Visual Studio, and found out XML process consumes most process time 
> too. Currently, I've made some change to the WFS layer, to utilize non-XML 
> methods, for more performance. Well, deviated from "WFS" actually.
> 
> Just curious, how others do it? I haven't got time to study other similar 
> maps on the map, but they seem to be better in performance. I've though a 
> little about using timed process to deal with timely process, such as WFS, 
> so the browser won't hang up while busy on processing XML data.
> 
> 
> ----- Original Message -----
> From: "Christopher Schmidt" <crschmidt at metacarta.com>
> To: "Jackey Cheung" <cheung.jackey at gmail.com>
> Cc: <users at openlayers.org>
> Sent: Wednesday, June 06, 2007 09:51
> Subject: Re: [OpenLayers-Users] WFS Layers blocks excution?
> 
>> On Wed, Jun 06, 2007 at 09:13:49AM +0800, Jackey Cheung wrote:
>>> I've updated to 2.4, it do improve quite a lot, but I'm still suffering
>>> noticeable (little, but still noticeable) lag while panning, and it takes
>>> around 1 second to load the layer when refresh. Is this normal?
>> I would say you're probably dealing with pretty standard behavior at
>> this point, yes.  If you get Firebug (debugging extension for Firefox)
>> you can watch the time that requesting data from the server actually
>> takes: this may help you determine whether your 1 second refresh time is
>> server or clientside.
>>
>>> You've mentioned about pathological dataset. I'm using MapServer as the 
>>> WFS
>>> server, returns 3 data fields (ID, Name, coord) in GML. Isn't it general?
>>> If you were referring to the server side process, I just wondering, does
>>> server side process affect the execution flow of the client side?
>> The server side execution doesn't affect the client.
>>
>>> What should I focus on to tune this WFS thing in OpenLayers?
>> First, get firebug and time the requests.
>> Second, turn on profiling and check out the time to do things in
>> Firefox. (You can't do this in IE, but the performance is going to be
>> mostly the same -- issues generally show up in both.) If you're seeing
>> major differences between IE and Firefox, my best advice is basically
>> "Good luck". I don't have any experience or advice in debuggin speed
>> issues in IE.
>>
>> Regards,
>> -- 
>> Christopher Schmidt
>> MetaCarta 
> 
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