We use Mixed replication in RDS mysql 5.6 and we are noticing replication lag every few minutes or so, the lag appears momentarily and then disappears. On slaves when we do show processlist we saw update and long insert queries (sometimes).
Previously in MYSQL 5.5 we used statement based replication and never encountered insert and update queries appearing on slaves, there are no other systems writing to slaves so this is ruled out.
Can any one suggests what could be the problem of this occasional lag.