Which is the faster: objects.tagcache or objecttags?

[rbourgeon]

And what if we want to update the tags of ALL objects because the tags of other objects might also have changed (because of external scripts)? To get the list of all objects, we would have to execute grp.all(), but since every item in this list already has a tagcache, would that be sufficient?

or would we have to loop over all the results of grp.all() and apply the function grp.gettags to each of the results? This seems a bit heavy