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Benchmarking MCP Tool Calls: Three Findings That Aren't 'Parallel Is Faster'

February 9, 2026 · 7 min read

5,300 measurements, 6 scenarios. The headline is 19.6× speedup — the real findings are that stdio isn't serial, framework overhead is zero, and a hardcoded constant was capping your throughput.

mcpbenchmarksperformancemcp-hangarconcurrencyopen-source

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