*Before*

13:27:55 kanru@anar:~/abs/xapian-core/src/xapian-build
% time notmuch tag +test id:hfntnu+gotv@eGroups.com
MOD_PLISTS: 368
notmuch tag +test id:hfntnu+gotv@eGroups.com  0.05s user 0.03s system 11% cpu 0.673 total
13:28:11 kanru@anar:~/abs/xapian-core/src/xapian-build
% time notmuch tag -test id:hfntnu+gotv@eGroups.com
MOD_PLISTS: 368
notmuch tag -test id:hfntnu+gotv@eGroups.com  0.06s user 0.01s system 10% cpu 0.681 total

*After*

13:30:40 kanru@anar:~/abs/xapian-core/src/xapian-build
% time notmuch tag +test id:hfntnu+gotv@eGroups.com
MOD_PLIST: 1
notmuch tag +test id:hfntnu+gotv@eGroups.com  0.01s user 0.02s system 6% cpu 0.436 total
13:31:23 kanru@anar:~/abs/xapian-core/src/xapian-build
% time notmuch tag -test id:hfntnu+gotv@eGroups.com
MOD_PLIST: 1
notmuch tag -test id:hfntnu+gotv@eGroups.com  0.01s user 0.01s system 5% cpu 0.383 total