http://donmeltz.com/blog/index.php/2011/06/10/arcgisqgis-faceoff/ arcgis 10 <-> QGIS 1.4 core2duo 3.06ghz <-> Pentium Mobile 1.6ghz 8GB RAM <-> 1GB RAM clipping de shapefile de 1.3gb 12 horas (erro) <-> 17min 20 sec (operação completada)