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SSE Benchmark

· One min read
The Rage Team
The Rage Team

Ran a benchmark to test SSE performance under sustained load. Two workers on a €12/month CCX13 Hetzner server handling 5K RPS to a SQLite-backed endpoint plus 5K concurrent SSE streams.

The setup:

  • 5K requests per second to an endpoint querying SQLite
  • 5K simultaneous SSE streams (5-10 seconds each, one message per second)
  • Streams replaced immediately on close to maintain constant 5K connections
  • Two Rage processes
  • 5 minute test duration

Results:

  • 120ms p95 latency
  • 7.75s average stream duration
  • 1,735,229 requests processed
  • 1,486,432 SSE messages sent
  • 0 errors

SSE Benchmark Results

The CCX13 server handles ~11K RPS to the SQLite endpoint without any streams. Adding 5K concurrent streams cuts throughput roughly in half instead of collapsing it - the fiber model handles I/O multiplexing the way it's supposed to, and scaling looks linear.

SSE Benchmark Repository