Github user joewitt commented on the issue:
https://github.com/apache/nifi/pull/2784
The performance improvement is clear. Old way is unable to keep up with
its own rate of production while new ways stays in lock step. Have a mirrored
flow (just diff versions of amqp processors). Old way can do 2500 messages/sec
with new way doing more than double. This is with client-side acks on and
testing in as apples to apples a way as possible. The new way can clearly go
far faster than 2x the old way.---
