[Paraview] How to extract a subdataset?

[Fred Fred]

I mean without having the subset be more memory consumming than its including part!
I have an unstructured data set with 9 scalar data fields, which occupies 573 MB, I clip it with a very small box (less than 1% of the whole domain) and the resulting subset occupies 1,920 MB!! Nice!
So:
  1) how is it possible?
  2) how to clip an unstructured dataset with the expected resulting effect on the memory size?


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