[Qgis-user] QGIS performance on large project

[John C. Tull]

Hi Kurt,

The other mail thread on raster performance, although focused on jp2 issues, covers this topic.
http://lists.osgeo.org/pipermail/qgis-user/2010-January/007576.html

Follow to the end where Craig mentions performance increases across other raster types. Unfortunately, you will need to venture into the development branch. I believe you can get nightly builds of the osgeo4w package, but I am not sure. You can also find build instructions for various platforms on the qgis wiki.

Good luck,
John

On Jan 23, 2010, at 5:49 AM, Kurt Menke wrote:

> Hello,
> I’m using QGIS as a redistributable platform for a large GIS project that spans all of western North America.  The project has 36 layers 8 of which are large raster datasets (*.img files).  Some of the rasters are ~350mb each.  I’m running the latest version 1.4.0-2.  I am running it on a pretty powerful workstation (windows XP) and am using the osgeo4w version. My primary user is using a MacBook Pro with Leopard and is using the standalone version.  He is experiencing pretty poor performance.  It  moves very very slowly, each operation.  Even turning off/on simple layers is taking up to 45 seconds. This occurs even if there are a handful of base layers turned on.
>  
> I’ve seen some discussion of slow start up issues and raster rendering issues. 
>  
> Would JasPer effect *.img rendering?  If so how can I determine if I or my MacBook user are running that? 
> Does QGIS utilize *.rrd pyramid files generated by ArcGIS?
> I’ve also generated spatial indices for all the vector layers.  Any other suggestions on how to improve performance or test for the bottle neck would be greatly appreciated.
> Thanks
> Kurt
>  
> **************************
> Kurt Menke, GISP
> Bird’s Eye View
> www.BirdsEyeViewGIS.com
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> Cell: 505-362-1776
>  
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