I've noticed that sometimes when I download leaderboard right after statistics update the leaderboard is not up to date with player data yet. Can you suggest some amount of time that I could add between request to make sure that the leaderboard will always have current user data?
Correct - when you send a statistic to the service, if you immediately query the leaderboard for that statistic, it likely won't have the latest value updated yet, as recomputing the leaderboard position for a player is triggered by the stat update and not the request (put another way, the request for a leaderboard is not request->recalculate->return, it's request->return, with the recalculation being a separate task triggered by new statistics being submitted - that helps to ensure that the leaderboard can always be returned as fast as possible). So when you update a statistic, it's best to wait a second before querying the leaderboard.
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