Consider two lattices: one is 3x3x3, the other is 5x5x5. The smaller lattice has 27 (33) nodes and the larger lattice has 125 (53) nodes. Increasing the resolution rapidly increases the number of nodes and the corresponding memory requirements.
The default lattice size is 50x50x50 with 125,000 nodes. This size works well with the amount of memory on most computers.
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