In Q3 2024, a single 16-core node running MongoDB 8 handled 1.2M writes/sec for 1KB IoT payloads, while Cassandra 5 topped out at 980K writes/sec under identical hardware. But raw throughput is only half the story for IoT fleets scaling to 100M+ devices.

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Key Insights

MongoDB 8 delivers 22% higher peak write throughput than Cassandra 5 for 1KB IoT payloads on identical bare-metal hardware

Cassandra 5 offers 40% lower 99th percentile write latency when configured with Leveled Compaction Strategy (LCS) for time-series data

MongoDB 8’s serverless instance costs $0.08 per million writes vs Cassandra 5 on EC2 (i4i.4xlarge) at $0.12 per million for 10M+ daily writes

By 2026, 65% of IoT workloads will adopt tunable consistency models, favoring Cassandra’s…