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I feel your pain, we have a few (big,replicated) legacy systems on 9.2 that need upgrading. pg_upgrade helps (and is quick if using hard links), but only for the master - slaves still need data to be rsync'ed.
PG10 does look very cool, logical replication and better control over the planner especially.
What postgres version are you running? I have seen some big improvements in query planning and overall performance with 9.6