Nicolas Ribot has kindly improved the SQLite based datastores so that the 
R-Tree spatial index is utilized if it exists for GeoPackages. This makes a 
huge speedup for dynamic browsing of GeoPackage layers which are added to the 
map through Open Datastore Layer.

The same speedup is available also for Spatialite databases but by now it 
requires that spatialite extension (mod_spatialite) is available. Perhaps 
easiest way for OpenJUMP users for getting mod_spatialite is to install the 
Spatialite reader plugin 

-Jukka Rahkonen-
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