Large number of deadlocks seen after upgrade to 2.4.14

We upgraded the BDB version to 2.4.14 and are using the latest 4.7 release. Without code change on our part we are seeing large number of deadlocks with the new version.
Do let me know if more information is needed.
BDB: 106 lockers
BDB: 106 lockers
BDB: 106 lockers
BDB: 106 lockers
BDB: Aborting locker 8000a651
BDB: MASTER: /m-db/m-db432816-3302-4c30-9dd0-e42a295c970c/master rep_send_message: msgv = 5 logv 14 gen = 149 eid -1, type log, LSN [825][1499447]
BDB: 107 lockers
BDB: Aborting locker 8000a652
BDB: 107 lockers
BDB: MASTER: /m-db/m-db432816-3302-4c30-9dd0-e42a295c970c/master rep_send_message: msgv = 5 logv 14 gen = 149 eid -1, type log, LSN [825][1500259] perm
BDB: MASTER: will await acknowledgement: need 1
BDB: 106 lockers
BDB: 106 lockers
BDB: Aborting locker 8000a65a
BDB: Aborting locker 8000a658
BDB: MASTER: got ack [825][1500259](149) from site rit-004:10502
BDB: 105 lockers
BDB: 103 lockers
BDB: Container - 5e69b5cf184b41ef8f0719e1b0f944a1.bdbxml - Updating document: 5ca1ab1e0a0571bf048c6e298618c7048c6e2ec315a3
BDB: 104 lockers
BDB: Container - 5e69b5cf184b41ef8f0719e1b0f944a1.bdbxml - Updating document: 5ca1ab1e0a0571bf048c6e298618c7048c6e2ec35d5d

Also an interesting observation the replica process which not doing any thing except keeping up with the master is eating 3/4 times more cpu than the master when i am creating and updating records in the xml db.
On a 4 cpu setup, the master process takes about half a cpu where as the replica is chewing upto 2 CPUs
What is the replica doing which is this cpu intensive?!?!?!

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