chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #188.

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📊 Benchmark Results

Generated: 2026-05-22 15:19 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	15.69 ns	5.244 ns	0.287 ns	15.43 ns	15.64 ns	16.00 ns	1.00	0.02	1	0.0032	80 B	1.00
EggMapper	23.41 ns	9.203 ns	0.504 ns	22.93 ns	23.37 ns	23.94 ns	1.49	0.04	2	0.0032	80 B	1.00
AutoMapper	71.38 ns	5.722 ns	0.314 ns	71.09 ns	71.34 ns	71.71 ns	4.55	0.07	3	0.0031	80 B	1.00
Mapster	27.40 ns	6.132 ns	0.336 ns	27.14 ns	27.29 ns	27.78 ns	1.75	0.03	2	0.0032	80 B	1.00
MapperlyMap	14.59 ns	3.297 ns	0.181 ns	14.43 ns	14.55 ns	14.78 ns	0.93	0.02	1	0.0032	80 B	1.00
AgileMapper	349.85 ns	48.783 ns	2.674 ns	347.67 ns	349.05 ns	352.84 ns	22.30	0.38	4	0.0134	344 B	4.30
EggMapperGenerator	16.53 ns	3.384 ns	0.185 ns	16.32 ns	16.62 ns	16.66 ns	1.05	0.02	1	0.0032	80 B	1.00
EggMapperClassMapper	15.98 ns	14.227 ns	0.780 ns	15.10 ns	16.24 ns	16.59 ns	1.02	0.05	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	18.26 ns	7.560 ns	0.414 ns	17.82 ns	18.31 ns	18.64 ns	1.00	0.03	1	0.0032	80 B	1.00
EggMap	27.80 ns	4.570 ns	0.250 ns	27.60 ns	27.71 ns	28.08 ns	1.52	0.03	2	0.0032	80 B	1.00
AutoMapper	70.54 ns	3.789 ns	0.208 ns	70.39 ns	70.45 ns	70.78 ns	3.86	0.08	4	0.0031	80 B	1.00
Mapster	36.46 ns	4.422 ns	0.242 ns	36.22 ns	36.45 ns	36.70 ns	2.00	0.04	3	0.0032	80 B	1.00
MapperlyMap	23.21 ns	5.368 ns	0.294 ns	22.94 ns	23.17 ns	23.53 ns	1.27	0.03	2	0.0041	104 B	1.30
AgileMapper	347.25 ns	17.064 ns	0.935 ns	346.24 ns	347.42 ns	348.09 ns	19.03	0.38	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	57.34 ns	35.568 ns	1.950 ns	55.33 ns	57.45 ns	59.23 ns	1.00	0.04	1	0.0107	272 B	1.00
EggMapper	68.84 ns	34.198 ns	1.874 ns	67.65 ns	67.86 ns	71.00 ns	1.20	0.05	2	0.0107	272 B	1.00
AutoMapper	107.05 ns	11.603 ns	0.636 ns	106.66 ns	106.70 ns	107.78 ns	1.87	0.06	3	0.0107	272 B	1.00
Mapster	70.41 ns	33.849 ns	1.855 ns	68.95 ns	69.78 ns	72.50 ns	1.23	0.05	2	0.0107	272 B	1.00
MapperlyMap	54.48 ns	19.112 ns	1.048 ns	53.30 ns	54.83 ns	55.30 ns	0.95	0.03	1	0.0108	272 B	1.00
AgileMapper	378.77 ns	7.725 ns	0.423 ns	378.42 ns	378.66 ns	379.24 ns	6.61	0.20	4	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	69.51 ns	11.78 ns	0.646 ns	68.83 ns	69.58 ns	70.11 ns	1.00	0.01	1	0.0126	320 B	1.00
EggMapper	87.65 ns	17.29 ns	0.948 ns	86.57 ns	88.10 ns	88.30 ns	1.26	0.02	2	0.0126	320 B	1.00
AutoMapper	136.33 ns	16.52 ns	0.905 ns	135.28 ns	136.82 ns	136.88 ns	1.96	0.02	3	0.0129	328 B	1.02
Mapster	90.97 ns	25.02 ns	1.371 ns	89.40 ns	91.56 ns	91.94 ns	1.31	0.02	2	0.0126	320 B	1.00
MapperlyMap	72.45 ns	17.27 ns	0.947 ns	71.36 ns	72.93 ns	73.07 ns	1.04	0.01	1	0.0126	320 B	1.00
AgileMapper	441.99 ns	40.01 ns	2.193 ns	439.46 ns	443.19 ns	443.32 ns	6.36	0.06	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	1.603 μs	0.1708 μs	0.0094 μs	1.593 μs	1.609 μs	1.609 μs	1.00	0.01	1	0.3529	0.0114	8.65 KB	1.00
EggMapper	1.807 μs	0.4927 μs	0.0270 μs	1.777 μs	1.813 μs	1.830 μs	1.13	0.02	1	0.3529	0.0114	8.65 KB	1.00
AutoMapper	2.361 μs	0.6675 μs	0.0366 μs	2.339 μs	2.341 μs	2.403 μs	1.47	0.02	2	0.4044	0.0114	9.95 KB	1.15
Mapster	1.771 μs	0.1020 μs	0.0056 μs	1.765 μs	1.771 μs	1.776 μs	1.10	0.01	1	0.3529	0.0114	8.65 KB	1.00
MapperlyMap	1.810 μs	0.4592 μs	0.0252 μs	1.781 μs	1.819 μs	1.829 μs	1.13	0.01	1	0.3529	0.0114	8.65 KB	1.00
AgileMapper	2.331 μs	0.2683 μs	0.0147 μs	2.319 μs	2.325 μs	2.347 μs	1.45	0.01	2	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	5.526 μs	1.3425 μs	0.0736 μs	5.483 μs	5.484 μs	5.611 μs	1.00	0.02	1	1.1139	0.0610	27.4 KB	1.00
EggMapper	5.925 μs	1.0350 μs	0.0567 μs	5.866 μs	5.930 μs	5.979 μs	1.07	0.02	1	1.1139	0.0610	27.4 KB	1.00
AutoMapper	6.728 μs	0.1603 μs	0.0088 μs	6.719 μs	6.726 μs	6.737 μs	1.22	0.01	1	1.1673	0.0687	28.7 KB	1.05
Mapster	6.169 μs	3.9070 μs	0.2142 μs	5.926 μs	6.251 μs	6.330 μs	1.12	0.04	1	1.1139	0.0610	27.4 KB	1.00
MapperlyMap	5.547 μs	1.4145 μs	0.0775 μs	5.468 μs	5.550 μs	5.623 μs	1.00	0.02	1	1.1139	0.0610	27.42 KB	1.00
AgileMapper	5.370 μs	1.9335 μs	0.1060 μs	5.295 μs	5.323 μs	5.491 μs	0.97	0.02	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	15.70 μs	4.836 μs	0.265 μs	15.40 μs	15.80 μs	15.90 μs	1.00	0.02	1	3.4790	0.8545	85.99 KB	1.00
EggMapper	18.56 μs	10.063 μs	0.552 μs	18.14 μs	18.36 μs	19.18 μs	1.18	0.04	1	3.4790	0.8545	85.99 KB	1.00
AutoMapper	21.51 μs	6.012 μs	0.330 μs	21.14 μs	21.63 μs	21.77 μs	1.37	0.03	1	3.8452	0.9460	94.34 KB	1.10
Mapster	16.07 μs	1.624 μs	0.089 μs	16.00 μs	16.03 μs	16.17 μs	1.02	0.02	1	3.4790	0.8545	85.99 KB	1.00
MapperlyMap	17.34 μs	2.769 μs	0.152 μs	17.21 μs	17.31 μs	17.51 μs	1.10	0.02	1	3.5095	0.8545	86.02 KB	1.00
AgileMapper	21.47 μs	2.417 μs	0.132 μs	21.34 μs	21.48 μs	21.60 μs	1.37	0.02	1	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	1,306.193 μs	1,770.317 μs	97.0371 μs	1,197.771 μs	1,335.915 μs	1,384.893 μs	1.004	0.09	3	3.9063	1.9531	96.09 KB	1.00
AutoMapperStartup	447.392 μs	1,262.580 μs	69.2063 μs	399.476 μs	415.965 μs	526.736 μs	0.344	0.05	2	3.9063	-	104.62 KB	1.09
MapsterStartup	2.749 μs	1.144 μs	0.0627 μs	2.688 μs	2.746 μs	2.814 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	1.312 ms	1.417 ms	0.0777 ms	1.239 ms	1.303 ms	1.393 ms	1.00	0.07	1	3.9063	-	96.01 KB	1.00
AutoMapper	4.193 ms	7.660 ms	0.4199 ms	3.734 ms	4.287 ms	4.557 ms	3.20	0.32	2	7.8125	-	310.48 KB	3.23
Mapster	4.402 ms	3.738 ms	0.2049 ms	4.167 ms	4.497 ms	4.541 ms	3.36	0.22	2	23.4375	15.6250	764.18 KB	7.96

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📝 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 '*'