Performance Improvements in .NET 6
summary
Hundreds of targeted fixes make .NET 6 noticeably faster: cancellation registration costs drop from ~150 ns/400 B in older releases to ~half the time and half the allocation by .NET 6; a pathological thread‑pool case falls from ~35 s to ~1 s by being aggressive about injecting threads; Random.NextBytes goes from ~70 µs to ~1 µs (≈70×); GUID parse hits ~30 ns; string interpolation becomes zero‑alloc with ~40 ns vs 160 ns previously; file I/O is truly async and doubles throughput while eliminating allocations; array pool cliff removed; overall thread‑pool blocking fixed and many vectorized hotspots are accelerated.
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chapters (15)
- 0:00Introduction to .NET 6 performance
- 7:14Revisiting past assumptions in threading
- 17:50Caching all the things in async
- 22:52Optimizing system libraries
- 33:06Vectorizing hot paths
- 38:02Special casing common inputs
- 41:38Removing array pool cliff
- 44:26Making async IO actually async
- 47:19Stopping unnecessary work in networking
- 49:07Making new faster
- 50:14Faster reflection with defensive copies
- 51:59Optimizing LINQ operations
- 54:27Stopping being lazy in crypto
- 56:36Building at compile time
- 58:44Summary and next steps
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