The attached patch speeds up tags matching ( 50s --> 5s for my most common
search ),
by turning on org-trust-scanner-tags within the matcher.

(When it's off, getting a non-inherited property's value causes a call to
org-entry-properties
to fetch all properties into a cache, including ALLTAGS; fetching ALLTAGS
involves
calling (org-get-tags-at), which is slow when org-trust-scanner-tags is
off.)

Can this cause problems / was this off for a reason?

thanks,

ilya