[OpenLayers-Users] WFS Layers blocks excution?

[Jackey Cheung]

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?

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?

What should I focus on to tune this WFS thing in OpenLayers?


----- Original Message -----
From: "Christopher Schmidt" <crschmidt at metacarta.com>
To: "Jackey Cheung" <cheung.jackey at gmail.com>
Cc: <users at openlayers.org>
Sent: Tuesday, June 05, 2007 12:29
Subject: Re: [OpenLayers-Users] WFS Layers blocks excution?

> On Tue, Jun 05, 2007 at 09:10:00AM +0800, Jackey Cheung wrote:
>> I don't know how OL sends out queries. If tile by tile with proper bbox,
>> there should be less than 100 (max.) pairs per tile; if it queries the
>> whole display area, there should be less than 1000 (avg.) pairs. However,
>> besides the coordinate, two more attribute data is queried, but I don't 
>> see
>> any impact by that.
>
> What version of OpenLayers are you using? WFS in 2.4 is greatly
> improved, and specifically, it only sends out one request, rathre than
> requesting in 'tiles'. I think upgrading to the latest version will
> actually be far more useful to you than using something older.
>
> If you are using 2.4, example HTML would be useful to help debug:
> perhaps there is something pathological in your dataset as well, so a
> link to the server might be useful, but I have a feeling just upgrading
> so that you're dealing with one request instead of 30 would be very
> useful.
>
> Regards,
> -- 
> Christopher Schmidt
> MetaCarta