"and not installed"?

[Michael_google gmail_Gersten]

This simple command takes a long time

port info depof:python26 and not installed

Is "and not installed" lacking any optimization, i.e, does it first
make a list that satisfies depof:python26, and then check only that
list for not installed, or does it make the entire list of all
non-installed ports, and then intersect the two lists?
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