To improve performance when working with extracts you can
optimize the extract. Optimizing moves the calculated fields you’ve
created into the extract so that they don’t have to be computed locally
every time you use them.
Optimize the extract by selecting a data source on the Data menu and then selecting .
When you modify the calculated field, the modified version will be used until you optimize the extract again.
Each time you optimize the extract, any deleted
calculations will be removed fro the extract, new ones will be added,
and modified ones will be updated.
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