Slow index performance

Working with Data
#1

I’ve migrated mongo replica set from 4.2.5 to 4.4.13. Suddenly performance of queries, which use multikey index, has dropped significantly. Preference of queries is secondaryPreferred
The pattern of Slow log warrnings is

          "keysExamined": 24,
        "docsExamined": 24,
        "numYields": 8,
        "nreturned": 24,
        "reslen": 639001,
        "locks": {
            "ReplicationStateTransition": {
                "acquireCount": {
                    "w": 9
                }
            },
            "Global": {
                "acquireCount": {
                    "r": 9
                }
            },
            "Database": {
                "acquireCount": {
                    "r": 9
                }
            },
            "Collection": {
                "acquireCount": {
                    "r": 9
                }
            },
            "Mutex": {
                "acquireCount": {
                    "r": 1
                }
            }
        },
        "storage": {},
        "protocol": "op_msg",
        "durationMillis": 174

Could someone provide any clues? Can it be related with locks.ReplicationStateInfo