”— title: ‘Spatial Indexes’ layout: post tags:  category: Uncategoried —
QGIS has the ability to create spatial indexes but the documentation only makes one opaque reference to what that means; ""A spatial index makes your spatial queries much faster"".
Dragons8mycat has a nice annecdote which makes it clearer. https://dragons8mycat.com/2015/05/12/why-spatial-indexes-are-really-important
and a few more sites
<a href=""https://dragons8mycat.com/2015/05/12/why-spatial-indexes-are-really-important/"">Short story on a quite extreme example</a>