chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #135.

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📊 Benchmark Results

Generated: 2026-03-27 14:20 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	13.92 ns	0.167 ns	0.009 ns	13.92 ns	13.92 ns	13.93 ns	1.00	0.00	1	0.0032	80 B	1.00
EggMapper	25.73 ns	2.885 ns	0.158 ns	25.55 ns	25.81 ns	25.84 ns	1.85	0.01	2	0.0032	80 B	1.00
AutoMapper	66.41 ns	1.024 ns	0.056 ns	66.35 ns	66.41 ns	66.47 ns	4.77	0.00	3	0.0031	80 B	1.00
Mapster	25.47 ns	8.434 ns	0.462 ns	25.12 ns	25.29 ns	25.99 ns	1.83	0.03	2	0.0032	80 B	1.00
MapperlyMap	14.03 ns	5.696 ns	0.312 ns	13.67 ns	14.20 ns	14.22 ns	1.01	0.02	1	0.0032	80 B	1.00
AgileMapper	344.51 ns	45.051 ns	2.469 ns	343.04 ns	343.13 ns	347.36 ns	24.74	0.15	4	0.0134	344 B	4.30
EggMapperGenerator	16.14 ns	3.954 ns	0.217 ns	15.89 ns	16.24 ns	16.29 ns	1.16	0.01	1	0.0032	80 B	1.00
EggMapperClassMapper	15.45 ns	0.544 ns	0.030 ns	15.42 ns	15.44 ns	15.48 ns	1.11	0.00	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	18.36 ns	4.951 ns	0.271 ns	18.17 ns	18.24 ns	18.67 ns	1.00	0.02	1	0.0032	80 B	1.00
EggMap	33.84 ns	6.498 ns	0.356 ns	33.45 ns	33.93 ns	34.15 ns	1.84	0.03	3	0.0032	80 B	1.00
AutoMapper	69.01 ns	4.487 ns	0.246 ns	68.77 ns	69.00 ns	69.26 ns	3.76	0.05	4	0.0031	80 B	1.00
Mapster	38.06 ns	22.276 ns	1.221 ns	36.66 ns	38.69 ns	38.85 ns	2.07	0.06	3	0.0032	80 B	1.00
MapperlyMap	22.57 ns	1.879 ns	0.103 ns	22.48 ns	22.56 ns	22.68 ns	1.23	0.02	2	0.0041	104 B	1.30
AgileMapper	347.65 ns	19.234 ns	1.054 ns	346.45 ns	348.07 ns	348.42 ns	18.94	0.25	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	53.53 ns	7.881 ns	0.432 ns	53.07 ns	53.61 ns	53.93 ns	1.00	0.01	1	0.0108	272 B	1.00
EggMapper	68.77 ns	43.218 ns	2.369 ns	67.35 ns	67.45 ns	71.50 ns	1.28	0.04	2	0.0107	272 B	1.00
AutoMapper	103.51 ns	35.816 ns	1.963 ns	102.32 ns	102.43 ns	105.77 ns	1.93	0.03	3	0.0107	272 B	1.00
Mapster	69.76 ns	31.546 ns	1.729 ns	67.89 ns	70.10 ns	71.30 ns	1.30	0.03	2	0.0107	272 B	1.00
MapperlyMap	51.73 ns	17.280 ns	0.947 ns	50.71 ns	51.92 ns	52.57 ns	0.97	0.02	1	0.0108	272 B	1.00
AgileMapper	376.83 ns	39.073 ns	2.142 ns	375.23 ns	375.99 ns	379.26 ns	7.04	0.06	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	70.24 ns	17.411 ns	0.954 ns	69.20 ns	70.44 ns	71.08 ns	1.00	0.02	1	0.0126	320 B	1.00
EggMapper	87.07 ns	9.030 ns	0.495 ns	86.61 ns	87.00 ns	87.60 ns	1.24	0.02	2	0.0126	320 B	1.00
AutoMapper	139.83 ns	29.095 ns	1.595 ns	138.22 ns	139.87 ns	141.41 ns	1.99	0.03	3	0.0129	328 B	1.02
Mapster	86.20 ns	8.571 ns	0.470 ns	85.74 ns	86.17 ns	86.68 ns	1.23	0.02	2	0.0126	320 B	1.00
MapperlyMap	66.37 ns	16.950 ns	0.929 ns	65.76 ns	65.91 ns	67.44 ns	0.95	0.02	1	0.0126	320 B	1.00
AgileMapper	413.20 ns	79.414 ns	4.353 ns	408.96 ns	412.97 ns	417.66 ns	5.88	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	1.729 μs	0.6941 μs	0.0380 μs	1.687 μs	1.740 μs	1.760 μs	1.00	0.03	1	0.3529	0.0114	8.65 KB	1.00
EggMapper	1.784 μs	0.3766 μs	0.0206 μs	1.763 μs	1.787 μs	1.804 μs	1.03	0.02	1	0.3529	0.0114	8.65 KB	1.00
AutoMapper	2.281 μs	0.7349 μs	0.0403 μs	2.254 μs	2.263 μs	2.328 μs	1.32	0.03	1	0.4044	0.0114	9.95 KB	1.15
Mapster	1.733 μs	0.2476 μs	0.0136 μs	1.718 μs	1.740 μs	1.743 μs	1.00	0.02	1	0.3529	0.0114	8.65 KB	1.00
MapperlyMap	1.948 μs	0.6367 μs	0.0349 μs	1.913 μs	1.947 μs	1.983 μs	1.13	0.03	1	0.3510	0.0076	8.65 KB	1.00
AgileMapper	2.403 μs	0.8114 μs	0.0445 μs	2.357 μs	2.405 μs	2.446 μs	1.39	0.03	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	5.157 μs	1.0703 μs	0.0587 μs	5.093 μs	5.170 μs	5.209 μs	1.00	0.01	1	1.1139	0.0610	27.4 KB	1.00
EggMapper	5.527 μs	0.4490 μs	0.0246 μs	5.502 μs	5.529 μs	5.551 μs	1.07	0.01	1	1.1139	0.0610	27.4 KB	1.00
AutoMapper	6.678 μs	1.5496 μs	0.0849 μs	6.590 μs	6.686 μs	6.759 μs	1.29	0.02	1	1.1673	0.0687	28.7 KB	1.05
Mapster	5.913 μs	0.9744 μs	0.0534 μs	5.877 μs	5.887 μs	5.974 μs	1.15	0.01	1	1.1139	0.0610	27.4 KB	1.00
MapperlyMap	5.251 μs	1.4671 μs	0.0804 μs	5.163 μs	5.269 μs	5.321 μs	1.02	0.02	1	1.1139	0.0610	27.42 KB	1.00
AgileMapper	5.077 μs	0.8424 μs	0.0462 μs	5.024 μs	5.103 μs	5.105 μs	0.98	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	16.40 μs	1.987 μs	0.109 μs	16.30 μs	16.39 μs	16.52 μs	1.00	0.01	1	3.4790	0.8545	85.99 KB	1.00
EggMapper	17.24 μs	5.666 μs	0.311 μs	17.01 μs	17.12 μs	17.60 μs	1.05	0.02	1	3.4790	0.8545	85.99 KB	1.00
AutoMapper	21.69 μs	4.333 μs	0.237 μs	21.42 μs	21.79 μs	21.87 μs	1.32	0.01	1	3.8452	0.9460	94.34 KB	1.10
Mapster	16.57 μs	1.290 μs	0.071 μs	16.50 μs	16.58 μs	16.64 μs	1.01	0.01	1	3.4790	0.8545	85.99 KB	1.00
MapperlyMap	17.48 μs	1.879 μs	0.103 μs	17.41 μs	17.43 μs	17.60 μs	1.07	0.01	1	3.5095	0.8545	86.02 KB	1.00
AgileMapper	19.57 μs	1.272 μs	0.070 μs	19.50 μs	19.56 μs	19.64 μs	1.19	0.01	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	1,333.469 μs	1,043.6032 μs	57.2034 μs	1,279.798 μs	1,326.959 μs	1,393.648 μs	1.001	0.05	3	3.9063	1.9531	95.98 KB	1.00
AutoMapperStartup	403.881 μs	656.1822 μs	35.9676 μs	367.585 μs	404.549 μs	439.510 μs	0.303	0.03	2	3.9063	-	104.07 KB	1.08
MapsterStartup	2.779 μs	0.2079 μs	0.0114 μs	2.766 μs	2.785 μs	2.786 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	1.346 ms	2.086 ms	0.1144 ms	1.220 ms	1.377 ms	1.443 ms	1.00	0.11	1	3.9063	1.9531	96.06 KB	1.00
AutoMapper	3.766 ms	8.053 ms	0.4414 ms	3.410 ms	3.627 ms	4.260 ms	2.81	0.36	2	7.8125	-	310.24 KB	3.23
Mapster	4.232 ms	9.048 ms	0.4960 ms	3.686 ms	4.354 ms	4.655 ms	3.16	0.40	2	23.4375	15.6250	757.4 KB	7.88

---

📝 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 '*'