Control scoring in case phrase queries?

Let's say I have a phrase query "a.b", And the occurrences of this phrase is more within a document compared to the number of documents that has its occurrence.
Going over every occurrence within a document to calculate its scoring is causing poor performance at the time of search.

One way to control scoring would be to give a constant score to all query results.
But we would like to know if there is any query attribute, to control or terminate scoring of terms within a document after a given number of terms "N" ?

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