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@GeologyDave GRASS v.overlay in the Processing toolbox can handle it but not in 30 sec on my pc @Taconic_Musings
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@GeologyDave @Taconic_Musings afaik the #QGIS ftools intersect tool uses GEOS github.com/qgis/QGIS/blob/master/src/core/qgsgeometry.cpp#L5813 so performance shld be improved there