Activating this on a field should be FASTER, right – and slower refers to unqualified searches vs. qualified searches?
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ok thank you. Isn’t that a little counterintuitive to how search usually works? Do you know why it is slower?
I imagine you’re thinking something like – if you’re searching fewer places (i.e. excluding some of the fields) or less total text, search should go faster, right?
But since each note is single database record, and the contents of all of the fields of the note are stored in a single string, I suspect that in order to exclude some of the fields from a search, Anki first has to pick and choose what parts of the string to search and what to ignore. The cost associated with that pick-and-choosing could be what slows things down.
[In answer to your question – No, I don’t know why it is slower. 
But I am curious if my theory holds water …]
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Interesting…
thank you very much!!