Hi Greg, I have changed the linger.ms configuration on the producer and yes it explains the difference in client version latencies, but I am still seeing the broker latency differences with this configuration.
Kafka broker 3.9.1, client 4.0.0, linger.ms = 0 50th percentile: 310us 90th percentile: 414us 99th percentile: 825us 99.9th percentile: 9813us Kafka broker 4.0.0, client 4.0.0, linger.ms = 0 50th percentile: 8193us 90th percentile: 10373us 99th percentile: 11109us 99.9th percentile: 13812us Regards, Dan This message and its attachments are confidential, may not be disclosed or used by any person other than the addressee and are intended only for the named recipient(s). If you are not the intended recipient, please notify the sender immediately and delete any copies of this message. LMAX Group is the holding company of LMAX Exchange, LMAX Global and LMAX Digital. Our registered address is Yellow Building, 1A Nicholas Road, London W11 4AN.