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As an example, Splunk recently shared that one of the reasons they choose Pulsar over Kafka is that Pulsar is 1.5x - 2x lower in CAPEX cost with 5x - 50x improvement in latency and 2x - 3x lower in OPEX due to layered architecture (from slide 34). They found this was due to Pulsar being better able to utilize disk IO with lower CPU utilization and better control over memory.
VG