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Performance was tested using the kafka-producer-perf-test.sh script and reassigning leadership of all partitions of a 100 partition topic. We see an end-to-end reduction in the p99.9 produce latency of the overall run of 88%, from 1675ms to 215ms (average of 3 runs). Digging deeper into the baseline, & rejected alternate, metadata RPC becomes slow due to slower produce RPCs ahead of Metadata RPC that make it slow. This results into metadata refresh being over slow for baseline & rejected alternate over all, resulting into higher latencies. KIP-951 doesn't rely on the Metadata RPC for the new leader information, hence sees better latencies.

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