@Aaron ,
Both producer and consumer are running on the same machine which eliminates the clock skew issue while calculating the latency. Also, queue is empty before the launch of the test.
I have System.currentTimeMillis() and System.nanoTime() calls in both producer and consumer and calculating the delta from the consumer using the same timestamps. Also, I removed the latch to ensure consumer runs forever.
I will reproduce the issue and share my observations.
Thanks for your thoughts.