[mapserver-users] Mapserver/PostGIS Faster Initial Load Time

[Mike Saunt]

Not sure if this helps but often with IIS there is a lag at startup to load
things up,  plenty of microsoft doco out there regarding it...
On Jun 9, 2012 4:13 PM, "Donald Kerr" <donald.kerr at dkerr.co.uk> wrote:

> Jeff,
>
> Great tip!
>
> My deployment uses a full compressed build of the openlayers.js file with
> some changes to vml.js (uses vml textpath - for <= IE8) and svg.js (uses
> text rotation - for Chrome and Firefox). This file comes in at 927 KB.
>
> I created a custom compressed build of the openlayers.js file, again
> including the vml and svg changes. The new file comes in at 443 KB; a very
> significant drop in size.
>
> Both files were built using the latest, hot off the press,
> OpenLayers-2.12-rc6.
>
> Prior to creating and using the new, smaller openlayers.js file, I tested
> the time to get the first raster image tile from boot up with the larger
> file which was 16 seconds. I did a one click zoom to the first layer that
> has PostGIS sitting behind it and that took a further 8 seconds. After that
> initial load of both layer types, everything is speedy with very little
> delay at all.
>
> I then substituted the new, smaller openlayers.js file and repeated the
> process from boot up. Low and behold, I get exactly the same results: 16
> seconds then 8 seconds. Whilst there is probably a time saving in terms of
> milliseconds, the perceptional difference is nil.
>
> However, I do agree that the smaller openlayers.js file is the way to go in
> terms of reducing unnecessary initial traffic and also having less
> javascript in memory; something that will no doubt aid Internet Explorer
> speed-wise as that particular platform is chronic at best.
>
> Thanks again for the tip.
>
> Regards,
>
> Donald
>
>
>
> -----Original Message-----
> From: mapserver-users-bounces at lists.osgeo.org
> [mailto:mapserver-users-bounces at lists.osgeo.org] On Behalf Of Jeff McKenna
> Sent: 08 June 2012 16:10
> To: mapserver-users at lists.osgeo.org
> Subject: Re: [mapserver-users] Mapserver/PostGIS Faster Initial Load Time
>
>
> On 12-06-06 4:35 PM, Donald Kerr wrote:
> > Basically my mapping setup is, from client to server, Openlayers
> > WMS/WFS (Internet Explorer on XP Pro SP3) - Mapserver CGI - Shapefile
> > (Tiffs) or PostGIS (XP Pro SP3 - IIS & FastCGI).
> >
> >>From boot up, the initial, or first load of maps, takes up to 15
> >>seconds.
> > After that, it flies along fine.
> >
> > I've tried pre-loading in a hidden browser instance but that didn't
> > work. I cannot get that initial load time down at all.
> >
> > Any tips to reduce the time taken for the first load of the software:
> > Specifically Mapserver whether it's creating the map from PostGIS or
> > the shapefile (Tiffs).
>
> I can give my experiences here.  I have a very slow server that I use for
> client demos, and I very often hit this exact same issue (my
> OpenLayers/MapServer WMS/WFS application takes very long to load initially,
> then zooms along).  In my case, the long initial load is always due to the
> large lib/OpenLayers.js file; I solve this by generating an
> 'OpenLayers-lite.js' file (through the instructions at
> http://docs.openlayers.org/library/deploying.html).
>
> I hope that helps someone along the way.
>
> Have a nice weekend all.
>
> -jeff
>
>
>
> --
> Jeff McKenna
> MapServer Consulting and Training Services
> http://www.gatewaygeomatics.com/
>
>
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