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Use of functions Area2D(Geometry) and Length2D(Geometry) for theme layer provokes memory leak. Memory usage increases continuously during pan and zoom. Shortly it causes fatal error: "Out of memory - shut down".
This problem exists at least from version 2008 till 2012.
OSGeo FDO provider for SDF (both versions 3.5 and 3.6). Provider for SHP works much better — memory usage increases during map panning and comes down on idle.