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.NET Logging's Zero-Alloc Hero: Source Gen Crushes the Competition

Picture your .NET API swallowing 10,000 log calls per second without a hiccup—no garbage collection frenzy, no stutters. Source-generated logging makes it real.

DevTools Feed Apr 03, 2026 3 min read
Benchmark table comparing .NET logging styles: source gen at 1.5ns with zero bytes allocated

⚡ Key Takeaways

  • Source-generated logging achieves 0B allocations and 1.5ns when disabled—60x faster than interpolation.
  • Ditch string interpolation; it builds full strings before level checks, wasting cycles.
  • Adopt [LoggerMessage] now: .NET team uses it internally for ultimate perf.
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#.NET logging #.NET performance #BenchmarkDotNet #logging benchmarks #source generators

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