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 > Work: 505-265-0243 > Cell: 505-362-1776 > > > _______________________________________________ > Qgis-user mailing list > [email protected] > http://lists.osgeo.org/mailman/listinfo/qgis-user
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