[mapguide-users] Performance Tips

[Walt Welton-Lair]

We recently (Auguest) fixed a bug with JPG quality.  See
https://mapguide.osgeo.org/servlets/Scarab/id/MG362.  I don't think that
made it into the 1.0.2 release.  The problem was a typo - the quality
was set to 7 (out of 100).  The fix set it to 75.

  _____  

From: Campbell, Keith A [mailto:keith.campbell at atkinsglobal.com] 
Sent: Tuesday, November 21, 2006 3:16 PM
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] Performance Tips


Thanks Andy.
 
I have tried base layers before and will have another look at them. I
guess there is some trade-off in that with a non-tiled map, you can zoom
to the exact location you wish to in one go, whereas with the tiled
option you may need several clicks to zoom/pan to where you want to be.
Overall it should be faster though.
 
Regarding image format, I think the template file is the
ajaxmappane.templ. I've tried using GIFs (which seem to give similar
quality / performance) and JPGs which produce a substandard map - unless
there is another parameter that can be fed to the mapagent, or perhaps
something more than simply 'JPG' to the FORMAT parameter, to control the
quality?
 
Regards,
 
Keith

  _____  

From: Andy Morsell [mailto:amorsell at spatialgis.com] 
Sent: 20 November 2006 18:06
To: users at mapguide.osgeo.org
Subject: RE: [mapguide-users] Performance Tips


I assume you are using the AJAX viewer.  Have you tried using Base
layers at all?  Once the tiles are created once, subsequent requests
should be faster.  This would help speed up the server side of things.
For pure bandwidth issues displaying the resultant image, you may want
to look at changing your map output format from PNG to GIF or JPG.  I
know this can be done in one of the web layout template files, but I
honestly can't remember where.  Hopefully someone else who reads this
can supply that information.
 

Andy 


  _____  

From: Campbell, Keith A [mailto:keith.campbell at atkinsglobal.com] 
Sent: Monday, November 20, 2006 9:50 AM
To: users at mapguide.osgeo.org
Subject: [mapguide-users] Performance Tips



I'd be very interested to hear what people have found that have a big
impact on performance. After spending some time just working around
problem after problem to get an application ready for production, I now
find that the app may be just too slow in the clients environment to be
of any use. I can guess at a few like size of map, number of layers,
complexity and format of data sources. What is good practise? What can
be tweaked to make things faster? Can the image type (of the map) and
resolution be changed? Is one themed layer better than several filtered
layers? I realise there are hardware factors that will make a big
difference, but I'd prefer to focus on software configuration at this
point.

Keith 



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