Hi,

Tested with:

- OpenJUMP Plus r.3803
- Windows 7 64-bit
- jre 1.7_07 64-bit
- polygon dataset with 1.1 million features, size 3.2 GB in JML format.

See what happen with the memory consumption when I start OpenJUMP and open the 
polygon dataset into an empty project:
 
After loading the dataset:
- Windows shows that Java consumes 5.7 GB of memory
- OJ shows that the amount of reserved memory is 3.7 GB

After deleting the layer from TOC and doing Carbage Collect so that there are 
no layers left in the project:
- Windows shows that Java consumes 6.1 GB of memory
- OJ shows that the amount of reserved memory is 5.0 GB

Memory consumption numbers seem to be true because my computer with totally 8 
GB of memory gets rather slow. Carbage Collect does not decrease the numbers at 
all and I did not find any other way for freeing the memory that shutting down 
OJ.

-Jukka Rahkonen-

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