org-trust-scanner-tags

org-trust-scanner-tags is a variable defined in `org.el'.
Its value is

nil

Documentation:
Should `org-get-tags-at' use the tags for the scanner.
This is for internal dynamical scoping only.
When this is non-nil, the function `org-get-tags-at' will return the value
of `org-scanner-tags' instead of building the list by itself. This
can lead to large speed-ups when the tags scanner is used in a file with
many entries, and when the list of tags is retrieved, for example to
obtain a list of properties. Building the tags list for each entry in such
a file becomes an N^2 operation - but with this variable set, it scales
as N.