I'm looking at QGIS 2.18.9 and using a polygon to select points from a large point layer (file based tab file).
I wondered why the process is so slow if you use plugins or analysis options? I ask because simply drawing the same polygon with the select tool works in seconds.
Tools tested include the intersection tool and Select Within plugin.
If the select tool is so much faster, is there not scope to improve the performance of the analysis in QGIS?