Object Synchronization just after joining a room

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Hi:
When a new player joins a room, There seems to be a little time difference before object synchronization like game characters from server to this player. So it's difficult to visit these objects during the time difference. Another problem is we don't know how long the time difference is, and there's still no such event as "Wait Until All Object Synchronization" to catch the point.
Is there any way to work it out, thanks.