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@@ -62,3 +62,19 @@ image::images/pivot-preview.jpg["Example of a {transform} pivot in {kib}"]
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IMPORTANT: The {transform} leaves your source index intact. It
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creates a new index that is dedicated to the transformed data.
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+
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+[[transform-performance]]
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+==== Performance considerations
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+
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+{transforms-cap} perform search aggregations on the source
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+indices then index the results into the destination index. Therefore, a
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+{transform} never takes less time than the cumulated duration of the
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+aggregation that it performs and the indexing process.
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+
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+For better performance, make sure that your search aggregations and queries are
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+optimized, so they don't process unnecessary data.
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+
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+NOTE: When you use <<search-aggregations-bucket-datehistogram-aggregation>>, the
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+queries are not considered optimal as they run through a significant amount of
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+data. For this reason, {transforms} performing date histogram aggregations take
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+longer to run.
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István Zoltán Szabó