Why scoring is expensive

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referring to this doc

for example, a score function is computationally expensive and it is sufficient to compute the score on a filtered set of documents.
why scoring is expensive in which terms we are talking about.

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You're missing the critical part of that text;

This can be useful if, for example, a score function is computationally expensive and it is sufficient to compute the score on a filtered set of documents.

I've highlighted the important parts, and italicised the most important part. It's saying that IF it is, not that it is, but for some use cases it might be.

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