https://bugzilla.wikimedia.org/show_bug.cgi?id=47741

       Web browser: ---
            Bug ID: 47741
           Summary: After creating a new account there is a lag in
                    preferences being set
           Product: MediaWiki extensions
           Version: unspecified
          Hardware: All
                OS: All
            Status: NEW
          Severity: normal
          Priority: Unprioritized
         Component: Echo
          Assignee: [email protected]
          Reporter: [email protected]
                CC: [email protected], [email protected],
                    [email protected]
    Classification: Unclassified
   Mobile Platform: ---

I'm seeing this in Echo because it automatically sets new preferences different
to the defaults but the same behavior might be present elsewhere.

Tested on mediawiki.org and test.wikipedia.org
I cannot reproduce it on my dev install that does not have production style
caching and replication

To replicate:
 create a new user.
 immediately go to Special:Preferences#mw-prefsection-echo
 note what preferences are set

A new user should have most email turned on, but I see most email turned off as
is default for existing users.

Refresh the page and the correct values are shown.

It could be a caching anomaly, but the code looks fine to me.

It could be replication lag between the master DB that the settings are saved
to and the slave DB that they are loaded from.

If it stays as a 5 second lag, it is an edge case that only affects me testing
that default preferences are being set.  If the lag varies it could affect real
users sometimes.

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