Hello Eyal, thanks once again for your interest in helping out.   I have not expressed myself correctly. I believe there is no backpressure, as I confirmed visually on the nifi UI. On the upper banner I see there are globally about 5000 flowfiles circulating at a particular time. I see some of the queues have 20, 50, 100, 200 flowfiles waiting at an instant. The queue that has more queued flow files is the kafka producer processor, that has about 2000. I believe these quantities are not sufficient to trigger backpressure-caused adjustment of scheduling of tasks.   Apache Benchmark sends concurrent http requests. In this case, i set each of the 5 client instances to send each 1000 requests concurrently.   I have thread pool sized to 96 and assigned 16 concurrent tasks to all of the critical path processors. Despite this, I get a low core load average (between 2 and 7), the disk's IOPS are in the dozens per second (the maximum that the disks allow is 3000). I'm all out of ideas at this point. 😄   Thanks for the support! ... View more