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It must be immediate, because Wikimedia can detect edit conflict (when someone update the article you are in the middle of editing)

• wwright 7y ago
  That doesn’t mean all reads have to be immediate, only some.
• alexis_fr 7y ago
  It must be immediate for logged-in users, but not others. It’s an excellent thing that Wikipedia doesn’t nudge people to log in all the time, and I susped 95% of users are not logged in.