chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #178.

[github-actions]

📊 Benchmark Results

Generated: 2026-05-02 09:00 UTC  ·  Download full artifacts

Column guide:
Mean = average execution time  ·  Error = half of 99.9 % confidence interval  ·  StdDev = standard deviation  ·  Min / Median / Max = statistical range  ·  Ratio = vs Manual baseline (lower = closer to hand-written speed)  ·  RatioSD = ratio std dev  ·  Rank = 1 is fastest  ·  Gen0/1/2 = GC collections per 1 000 ops  ·  Allocated = managed heap per operation  ·  Alloc Ratio = allocation ratio vs baseline

🔵 Flat Mapping — 10-property object

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	15.26 ns	5.485 ns	0.301 ns	15.00 ns	15.18 ns	15.59 ns	1.00	0.02	1	0.0032	80 B	1.00
EggMapper	25.49 ns	6.027 ns	0.330 ns	25.26 ns	25.33 ns	25.87 ns	1.67	0.03	2	0.0032	80 B	1.00
AutoMapper	69.34 ns	4.433 ns	0.243 ns	69.19 ns	69.22 ns	69.62 ns	4.55	0.08	3	0.0031	80 B	1.00
Mapster	28.82 ns	3.372 ns	0.185 ns	28.69 ns	28.74 ns	29.03 ns	1.89	0.03	2	0.0032	80 B	1.00
MapperlyMap	14.86 ns	6.419 ns	0.352 ns	14.57 ns	14.76 ns	15.25 ns	0.97	0.03	1	0.0032	80 B	1.00
AgileMapper	350.33 ns	11.077 ns	0.607 ns	349.67 ns	350.46 ns	350.87 ns	22.97	0.39	4	0.0134	344 B	4.30
EggMapperGenerator	16.50 ns	1.687 ns	0.092 ns	16.41 ns	16.50 ns	16.59 ns	1.08	0.02	1	0.0032	80 B	1.00
EggMapperClassMapper	16.22 ns	4.829 ns	0.265 ns	16.03 ns	16.10 ns	16.52 ns	1.06	0.02	1	0.0032	80 B	1.00

🟡 Flattening — 2 nested objects → 8 flat properties

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	18.65 ns	1.075 ns	0.059 ns	18.59 ns	18.64 ns	18.71 ns	1.00	0.00	1	0.0032	80 B	1.00
EggMap	28.55 ns	11.727 ns	0.643 ns	27.94 ns	28.49 ns	29.22 ns	1.53	0.03	2	0.0032	80 B	1.00
AutoMapper	74.85 ns	5.567 ns	0.305 ns	74.51 ns	74.92 ns	75.11 ns	4.01	0.02	4	0.0031	80 B	1.00
Mapster	37.15 ns	3.810 ns	0.209 ns	37.00 ns	37.07 ns	37.39 ns	1.99	0.01	3	0.0032	80 B	1.00
MapperlyMap	23.83 ns	4.589 ns	0.252 ns	23.57 ns	23.84 ns	24.07 ns	1.28	0.01	2	0.0041	104 B	1.30
AgileMapper	349.16 ns	15.530 ns	0.851 ns	348.39 ns	349.01 ns	350.07 ns	18.73	0.06	5	0.0134	344 B	4.30

🟣 Deep Mapping — 2 nested address objects

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	55.20 ns	11.78 ns	0.646 ns	54.56 ns	55.21 ns	55.85 ns	1.00	0.01	1	0.0107	272 B	1.00
EggMapper	66.44 ns	37.79 ns	2.071 ns	64.63 ns	65.99 ns	68.70 ns	1.20	0.03	1	0.0107	272 B	1.00
AutoMapper	106.42 ns	31.31 ns	1.716 ns	105.03 ns	105.90 ns	108.34 ns	1.93	0.03	2	0.0107	272 B	1.00
Mapster	70.63 ns	33.96 ns	1.862 ns	68.78 ns	70.62 ns	72.50 ns	1.28	0.03	1	0.0107	272 B	1.00
MapperlyMap	52.27 ns	10.52 ns	0.577 ns	51.72 ns	52.22 ns	52.87 ns	0.95	0.01	1	0.0108	272 B	1.00
AgileMapper	378.97 ns	38.31 ns	2.100 ns	377.46 ns	378.09 ns	381.37 ns	6.87	0.08	3	0.0167	424 B	1.56

🟢 Complex Mapping — nested object + collection

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	70.22 ns	22.149 ns	1.214 ns	69.09 ns	70.06 ns	71.51 ns	1.00	0.02	1	0.0126	320 B	1.00
EggMapper	90.55 ns	21.752 ns	1.192 ns	89.36 ns	90.55 ns	91.75 ns	1.29	0.02	2	0.0126	320 B	1.00
AutoMapper	135.17 ns	8.767 ns	0.481 ns	134.73 ns	135.09 ns	135.68 ns	1.93	0.03	3	0.0129	328 B	1.02
Mapster	92.66 ns	24.613 ns	1.349 ns	91.31 ns	92.64 ns	94.01 ns	1.32	0.03	2	0.0126	320 B	1.00
MapperlyMap	69.85 ns	11.169 ns	0.612 ns	69.27 ns	69.79 ns	70.49 ns	0.99	0.02	1	0.0126	320 B	1.00
AgileMapper	420.84 ns	39.947 ns	2.190 ns	418.46 ns	421.28 ns	422.77 ns	5.99	0.09	4	0.0210	528 B	1.65

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	1.574 μs	0.1139 μs	0.0062 μs	1.567 μs	1.573 μs	1.580 μs	1.00	0.00	1	0.3529	0.0114	8.65 KB	1.00
EggMapper	1.756 μs	0.0542 μs	0.0030 μs	1.753 μs	1.756 μs	1.759 μs	1.12	0.00	1	0.3529	0.0114	8.65 KB	1.00
AutoMapper	2.347 μs	0.2894 μs	0.0159 μs	2.335 μs	2.340 μs	2.365 μs	1.49	0.01	1	0.4044	0.0114	9.95 KB	1.15
Mapster	1.631 μs	0.2195 μs	0.0120 μs	1.618 μs	1.633 μs	1.642 μs	1.04	0.01	1	0.3529	0.0114	8.65 KB	1.00
MapperlyMap	1.996 μs	0.5261 μs	0.0288 μs	1.968 μs	1.993 μs	2.026 μs	1.27	0.02	1	0.3510	0.0076	8.65 KB	1.00
AgileMapper	2.568 μs	0.7871 μs	0.0431 μs	2.524 μs	2.569 μs	2.610 μs	1.63	0.02	1	0.3624	0.0114	8.91 KB	1.03

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	5.410 μs	1.0008 μs	0.0549 μs	5.360 μs	5.401 μs	5.469 μs	1.00	0.01	1	1.1139	0.0610	27.4 KB	1.00
EggMapper	5.781 μs	2.0004 μs	0.1096 μs	5.694 μs	5.744 μs	5.904 μs	1.07	0.02	1	1.1139	0.0610	27.4 KB	1.00
AutoMapper	6.755 μs	3.1989 μs	0.1753 μs	6.622 μs	6.690 μs	6.954 μs	1.25	0.03	1	1.1673	0.0687	28.7 KB	1.05
Mapster	6.004 μs	2.6147 μs	0.1433 μs	5.902 μs	5.942 μs	6.168 μs	1.11	0.02	1	1.1139	0.0610	27.4 KB	1.00
MapperlyMap	5.360 μs	1.3012 μs	0.0713 μs	5.277 μs	5.397 μs	5.405 μs	0.99	0.01	1	1.1139	0.0610	27.42 KB	1.00
AgileMapper	5.230 μs	0.1798 μs	0.0099 μs	5.223 μs	5.226 μs	5.242 μs	0.97	0.01	1	0.6790	0.0381	16.72 KB	0.61

🟠 Collection — 100-item List<T>

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
Manual	17.12 μs	5.577 μs	0.306 μs	16.92 μs	16.98 μs	17.48 μs	1.00	0.02	1	3.4790	0.8545	85.99 KB	1.00
EggMapper	17.27 μs	5.325 μs	0.292 μs	16.93 μs	17.40 μs	17.47 μs	1.01	0.02	1	3.4790	0.8545	85.99 KB	1.00
AutoMapper	21.54 μs	3.664 μs	0.201 μs	21.39 μs	21.47 μs	21.77 μs	1.26	0.02	2	3.8452	0.9460	94.34 KB	1.10
Mapster	16.25 μs	8.047 μs	0.441 μs	15.85 μs	16.17 μs	16.73 μs	0.95	0.03	1	3.4790	0.8545	85.99 KB	1.00
MapperlyMap	17.32 μs	10.792 μs	0.592 μs	16.63 μs	17.60 μs	17.71 μs	1.01	0.03	1	3.5095	0.8545	86.02 KB	1.00
AgileMapper	21.95 μs	6.874 μs	0.377 μs	21.64 μs	21.84 μs	22.37 μs	1.28	0.03	2	3.5095	0.8545	86.25 KB	1.00

⚪ Startup / Configuration time

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
EggMapperStartup	1,341.300 μs	1,488.644 μs	81.5976 μs	1,283.721 μs	1,305.501 μs	1,434.678 μs	1.002	0.07	3	1.9531	-	95.12 KB	1.00
AutoMapperStartup	396.219 μs	364.562 μs	19.9829 μs	380.462 μs	389.500 μs	418.696 μs	0.296	0.02	2	3.9063	-	104.22 KB	1.10
MapsterStartup	2.774 μs	1.095 μs	0.0600 μs	2.726 μs	2.755 μs	2.841 μs	0.002	0.00	1	0.4692	0.0114	11.51 KB	0.12

EggMapper.Benchmarks.ColdStartBenchmark-report-github

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
EggMapper	1.388 ms	1.858 ms	0.1018 ms	1.325 ms	1.333 ms	1.506 ms	1.00	0.09	1	3.9063	1.9531	96.06 KB	1.00
AutoMapper	4.278 ms	8.600 ms	0.4714 ms	3.756 ms	4.406 ms	4.672 ms	3.09	0.35	2	7.8125	-	309.95 KB	3.23
Mapster	4.331 ms	7.485 ms	0.4103 ms	3.867 ms	4.476 ms	4.649 ms	3.13	0.32	2	23.4375	15.6250	757.71 KB	7.89

---

📝 Notes

• Each benchmark class is decorated with [MemoryDiagnoser] and [RankColumn].
• The global config (see src/EggMapper.Benchmarks/Program.cs) adds Min, Median, and Max columns.
• Manual is the hand-written baseline (ratio = 1.00). A ratio < 1 means faster than manual.
• Benchmarks run on GitHub-hosted runners — absolute times may vary between runs; focus on Ratio for comparisons.
• To reproduce locally:

  cd src/EggMapper.Benchmarks
  dotnet run --configuration Release -- --filter '*'