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One is for people who are not logged in, the other is per specific user that you wish to convey a subtle message to leave.

Difference in the wording is that you are trying to discourage all visitors (aka, those that just want to leech information off your site rather than signing up). You could put a banner at the top if they are a guest that says "Having page loading problems? Register to remove those difficulties!"

The other is just specific per user you want to leave.