Feature request #2904
join attributes very slow when vector layer contains many features
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Using a polygon layer with about 20,000 polygons and a dbf containing information for a bit over 5000 thousand of these polygons, joining them with Vector->Join attributes using a common key of 9 chars (letters, numbers and -) takes horrendously long, with a CPU usage close to 100% throughout the process.
Classyfying this as an annoyance and a wish for enhancement for now, but at least one colleague stopped using QGIS for this reason, so it could be seen as a major bug...
This is somewhat linked to wish #121, but as long as that is not fulfilled, this is the only way to join attributes and thus concerns an important feature.