Hi all. I return on the old bug https://trac.osgeo.org/qgis/ticket/1978 I have done some testing, and in fact QGIS is almost unusable with large and complex data sets (see e.g. https://int.faunalia.it/~paolo/slow.tar.gz ). Adding caching helps, but this is proving to be a real stumbling block, preventing real world use in some cases. I checked, and unfortunately proprietary sw opens the same file much faster, and subsequent zooming and panning etc. is also much smoother. According to the trac, also other free sw is much faster. Can someone help me understand in which direction to work to solve this? All the best. -- http://www.faunalia.it/pc
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