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It would be better to save the global meta tags in the database table; this would slightly reduce the amount of memory required by Drupal variables, which are loaded in memory every time Drupal makes a complete bootstrap.
It also doesn't make sense to load those values in memory all times, as they are required in specific moments.
Comments
Comment #1
apadernoThe global meta tag values should be rather called "default meta tag values", as they are the values used when there isn't a specific value set for the user, node, taxonomy term.
Comment #2
apadernoThe code has been changed, and committed in CVS.
Comment #3
apaderno