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.k...@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-boun...@lists.osgeo.org
[mailto:mapserver-users-boun...@lists.osgeo.org] On Behalf Of Jeff McKenna
Sent: 08 June 2012 16:10
To: mapserver-users@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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