chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #181.

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📊 Benchmark Results

Generated: 2026-05-02 09:18 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	16.18 ns	13.971 ns	0.766 ns	15.45 ns	16.11 ns	16.97 ns	1.00	0.06	1	0.0048	80 B	1.00
EggMapper	25.97 ns	5.828 ns	0.319 ns	25.69 ns	25.90 ns	26.32 ns	1.61	0.07	2	0.0048	80 B	1.00
AutoMapper	87.60 ns	3.614 ns	0.198 ns	87.38 ns	87.63 ns	87.77 ns	5.42	0.22	3	0.0048	80 B	1.00
Mapster	29.36 ns	12.565 ns	0.689 ns	28.68 ns	29.33 ns	30.06 ns	1.82	0.08	2	0.0048	80 B	1.00
MapperlyMap	16.09 ns	3.522 ns	0.193 ns	15.88 ns	16.15 ns	16.25 ns	1.00	0.04	1	0.0048	80 B	1.00
AgileMapper	513.91 ns	36.185 ns	1.983 ns	512.32 ns	513.29 ns	516.13 ns	31.81	1.30	4	0.0200	344 B	4.30
EggMapperGenerator	16.73 ns	13.979 ns	0.766 ns	16.20 ns	16.38 ns	17.61 ns	1.04	0.06	1	0.0048	80 B	1.00
EggMapperClassMapper	16.18 ns	2.337 ns	0.128 ns	16.06 ns	16.17 ns	16.31 ns	1.00	0.04	1	0.0048	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	20.23 ns	6.544 ns	0.359 ns	19.87 ns	20.23 ns	20.59 ns	1.00	0.02	1	0.0048	80 B	1.00
EggMap	32.12 ns	36.331 ns	1.991 ns	30.88 ns	31.06 ns	34.41 ns	1.59	0.09	3	0.0048	80 B	1.00
AutoMapper	87.34 ns	0.788 ns	0.043 ns	87.30 ns	87.34 ns	87.38 ns	4.32	0.07	5	0.0048	80 B	1.00
Mapster	37.63 ns	6.449 ns	0.353 ns	37.33 ns	37.55 ns	38.02 ns	1.86	0.03	4	0.0048	80 B	1.00
MapperlyMap	25.50 ns	5.945 ns	0.326 ns	25.12 ns	25.66 ns	25.70 ns	1.26	0.02	2	0.0062	104 B	1.30
AgileMapper	508.29 ns	13.547 ns	0.743 ns	507.49 ns	508.42 ns	508.96 ns	25.13	0.39	6	0.0200	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	57.61 ns	9.511 ns	0.521 ns	57.04 ns	57.72 ns	58.07 ns	1.00	0.01	1	0.0162	272 B	1.00
EggMapper	68.23 ns	32.144 ns	1.762 ns	66.23 ns	68.90 ns	69.56 ns	1.18	0.03	1	0.0162	272 B	1.00
AutoMapper	127.50 ns	7.564 ns	0.415 ns	127.02 ns	127.72 ns	127.76 ns	2.21	0.02	2	0.0162	272 B	1.00
Mapster	71.09 ns	9.541 ns	0.523 ns	70.72 ns	70.86 ns	71.69 ns	1.23	0.01	1	0.0162	272 B	1.00
MapperlyMap	53.49 ns	7.581 ns	0.416 ns	53.01 ns	53.70 ns	53.77 ns	0.93	0.01	1	0.0162	272 B	1.00
AgileMapper	515.91 ns	85.139 ns	4.667 ns	510.96 ns	516.53 ns	520.23 ns	8.96	0.10	3	0.0248	424 B	1.56

🟢 Complex Mapping — nested object + collection

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	75.21 ns	20.182 ns	1.106 ns	73.94 ns	75.77 ns	75.93 ns	1.00	0.02	1	0.0191	320 B	1.00
EggMapper	93.77 ns	33.030 ns	1.811 ns	91.77 ns	94.22 ns	95.31 ns	1.25	0.03	2	0.0191	320 B	1.00
AutoMapper	161.06 ns	8.100 ns	0.444 ns	160.56 ns	161.19 ns	161.42 ns	2.14	0.03	3	0.0196	328 B	1.02
Mapster	94.66 ns	32.789 ns	1.797 ns	92.59 ns	95.65 ns	95.75 ns	1.26	0.03	2	0.0191	320 B	1.00
MapperlyMap	75.18 ns	13.763 ns	0.754 ns	74.33 ns	75.43 ns	75.77 ns	1.00	0.02	1	0.0191	320 B	1.00
AgileMapper	587.33 ns	51.592 ns	2.828 ns	585.21 ns	586.24 ns	590.54 ns	7.81	0.11	4	0.0315	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	1.814 μs	2.1426 μs	0.1174 μs	1.718 μs	1.779 μs	1.945 μs	1.00	0.08	1	0.5283	0.0172	8.65 KB	1.00
EggMapper	1.808 μs	0.3868 μs	0.0212 μs	1.784 μs	1.817 μs	1.824 μs	1.00	0.06	1	0.5283	0.0172	8.65 KB	1.00
AutoMapper	2.505 μs	1.1067 μs	0.0607 μs	2.440 μs	2.518 μs	2.559 μs	1.38	0.08	2	0.6065	0.0191	9.95 KB	1.15
Mapster	1.895 μs	0.2856 μs	0.0157 μs	1.878 μs	1.900 μs	1.908 μs	1.05	0.06	1	0.5283	0.0172	8.65 KB	1.00
MapperlyMap	1.945 μs	1.0987 μs	0.0602 μs	1.876 μs	1.970 μs	1.988 μs	1.07	0.07	1	0.5264	0.0153	8.65 KB	1.00
AgileMapper	2.663 μs	0.7668 μs	0.0420 μs	2.617 μs	2.672 μs	2.700 μs	1.47	0.08	2	0.5417	0.0153	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	0.8392 μs	0.0460 μs	5.498 μs	5.501 μs	5.579 μs	1.00	0.01	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	6.121 μs	0.9912 μs	0.0543 μs	6.061 μs	6.133 μs	6.167 μs	1.11	0.01	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	7.068 μs	2.5224 μs	0.1383 μs	6.911 μs	7.125 μs	7.169 μs	1.28	0.02	1	1.7548	0.1068	28.7 KB	1.05
Mapster	6.324 μs	2.3766 μs	0.1303 μs	6.204 μs	6.306 μs	6.463 μs	1.14	0.02	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	6.161 μs	1.3311 μs	0.0730 μs	6.103 μs	6.137 μs	6.243 μs	1.11	0.01	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.727 μs	1.7560 μs	0.0963 μs	5.629 μs	5.730 μs	5.821 μs	1.04	0.02	1	1.0223	0.0610	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	17.74 μs	3.108 μs	0.170 μs	17.58 μs	17.72 μs	17.92 μs	1.00	0.01	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	18.03 μs	4.855 μs	0.266 μs	17.72 μs	18.17 μs	18.19 μs	1.02	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	22.52 μs	14.378 μs	0.788 μs	21.68 μs	22.64 μs	23.24 μs	1.27	0.04	1	5.7678	1.4343	94.34 KB	1.10
Mapster	18.00 μs	5.669 μs	0.311 μs	17.64 μs	18.18 μs	18.18 μs	1.01	0.02	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	19.57 μs	6.054 μs	0.332 μs	19.20 μs	19.66 μs	19.85 μs	1.10	0.02	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	21.14 μs	10.650 μs	0.584 μs	20.74 μs	20.87 μs	21.81 μs	1.19	0.03	1	5.2795	1.3123	86.25 KB	1.00

⚪ Startup / Configuration time

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Gen1	Allocated	Alloc Ratio
EggMapperStartup	1,373.583 μs	1,163.7488 μs	63.7890 μs	1,314.076 μs	1,365.743 μs	1,440.930 μs	1.001	0.06	3	5.8594	-	95.67 KB	1.00
AutoMapperStartup	460.038 μs	765.0192 μs	41.9333 μs	417.447 μs	461.386 μs	501.281 μs	0.335	0.03	2	5.8594	-	104.04 KB	1.09
MapsterStartup	2.591 μs	0.7054 μs	0.0387 μs	2.549 μs	2.599 μs	2.625 μs	0.002	0.00	1	0.7019	0.0267	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	1.383 ms	1.922 ms	0.1054 ms	1.273 ms	1.394 ms	1.483 ms	1.00	0.09	1	5.8594	3.9063	96.21 KB	1.00
AutoMapper	3.901 ms	10.006 ms	0.5485 ms	3.394 ms	3.825 ms	4.483 ms	2.83	0.39	2	15.6250	7.8125	309.84 KB	3.22
Mapster	4.752 ms	6.316 ms	0.3462 ms	4.362 ms	4.872 ms	5.023 ms	3.45	0.32	3	46.8750	15.6250	766.15 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 '*'