chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #179.

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📊 Benchmark Results

Generated: 2026-05-02 09:08 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	12.06 ns	1.213 ns	0.066 ns	11.98 ns	12.07 ns	12.12 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMapper	21.46 ns	2.491 ns	0.137 ns	21.31 ns	21.52 ns	21.56 ns	1.78	0.01	2	0.0048	80 B	1.00
AutoMapper	56.98 ns	2.362 ns	0.129 ns	56.88 ns	56.94 ns	57.13 ns	4.73	0.02	3	0.0048	80 B	1.00
Mapster	22.76 ns	9.992 ns	0.548 ns	22.15 ns	22.93 ns	23.20 ns	1.89	0.04	2	0.0048	80 B	1.00
MapperlyMap	12.92 ns	1.259 ns	0.069 ns	12.84 ns	12.94 ns	12.97 ns	1.07	0.01	1	0.0048	80 B	1.00
AgileMapper	255.37 ns	113.682 ns	6.231 ns	251.57 ns	251.98 ns	262.56 ns	21.18	0.46	4	0.0205	344 B	4.30
EggMapperGenerator	13.17 ns	4.095 ns	0.224 ns	12.92 ns	13.22 ns	13.35 ns	1.09	0.02	1	0.0048	80 B	1.00
EggMapperClassMapper	13.19 ns	1.358 ns	0.074 ns	13.10 ns	13.23 ns	13.24 ns	1.09	0.01	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	15.82 ns	1.051 ns	0.058 ns	15.79 ns	15.79 ns	15.89 ns	1.00	0.00	1	0.0048	80 B	1.00
EggMap	24.28 ns	1.981 ns	0.109 ns	24.17 ns	24.29 ns	24.38 ns	1.53	0.01	3	0.0048	80 B	1.00
AutoMapper	61.78 ns	29.774 ns	1.632 ns	60.80 ns	60.88 ns	63.66 ns	3.90	0.09	4	0.0048	80 B	1.00
Mapster	27.75 ns	5.924 ns	0.325 ns	27.42 ns	27.77 ns	28.07 ns	1.75	0.02	3	0.0048	80 B	1.00
MapperlyMap	19.82 ns	1.059 ns	0.058 ns	19.76 ns	19.84 ns	19.87 ns	1.25	0.01	2	0.0062	104 B	1.30
AgileMapper	251.74 ns	60.159 ns	3.298 ns	249.84 ns	249.84 ns	255.55 ns	15.91	0.19	5	0.0205	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	46.16 ns	5.528 ns	0.303 ns	45.86 ns	46.14 ns	46.47 ns	1.00	0.01	1	0.0162	272 B	1.00
EggMapper	57.67 ns	9.803 ns	0.537 ns	57.05 ns	57.94 ns	58.01 ns	1.25	0.01	2	0.0162	272 B	1.00
AutoMapper	84.17 ns	3.173 ns	0.174 ns	83.99 ns	84.18 ns	84.33 ns	1.82	0.01	3	0.0162	272 B	1.00
Mapster	58.70 ns	4.348 ns	0.238 ns	58.44 ns	58.78 ns	58.89 ns	1.27	0.01	2	0.0162	272 B	1.00
MapperlyMap	41.76 ns	1.316 ns	0.072 ns	41.72 ns	41.72 ns	41.84 ns	0.90	0.01	1	0.0162	272 B	1.00
AgileMapper	268.69 ns	10.827 ns	0.593 ns	268.17 ns	268.56 ns	269.34 ns	5.82	0.03	4	0.0253	424 B	1.56

🟢 Complex Mapping — nested object + collection

Method	Mean	Error	StdDev	Min	Median	Max	Ratio	RatioSD	Rank	Gen0	Allocated	Alloc Ratio
Manual	62.46 ns	9.915 ns	0.543 ns	61.84 ns	62.67 ns	62.87 ns	1.00	0.01	1	0.0191	320 B	1.00
EggMapper	82.26 ns	6.661 ns	0.365 ns	81.85 ns	82.41 ns	82.53 ns	1.32	0.01	2	0.0191	320 B	1.00
AutoMapper	116.19 ns	4.830 ns	0.265 ns	116.02 ns	116.06 ns	116.50 ns	1.86	0.01	3	0.0196	328 B	1.02
Mapster	80.02 ns	10.161 ns	0.557 ns	79.53 ns	79.92 ns	80.62 ns	1.28	0.01	2	0.0191	320 B	1.00
MapperlyMap	63.21 ns	20.626 ns	1.131 ns	61.95 ns	63.54 ns	64.14 ns	1.01	0.02	1	0.0191	320 B	1.00
AgileMapper	327.74 ns	47.226 ns	2.589 ns	325.76 ns	326.80 ns	330.67 ns	5.25	0.05	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	1.588 μs	0.6233 μs	0.0342 μs	1.549 μs	1.602 μs	1.613 μs	1.00	0.03	1	0.5283	0.0172	8.65 KB	1.00
EggMapper	1.731 μs	0.4480 μs	0.0246 μs	1.706 μs	1.731 μs	1.755 μs	1.09	0.02	1	0.5283	0.0172	8.65 KB	1.00
AutoMapper	2.126 μs	1.4036 μs	0.0769 μs	2.066 μs	2.098 μs	2.213 μs	1.34	0.05	1	0.6065	0.0191	9.95 KB	1.15
Mapster	1.686 μs	1.2764 μs	0.0700 μs	1.643 μs	1.648 μs	1.767 μs	1.06	0.04	1	0.5283	0.0172	8.65 KB	1.00
MapperlyMap	1.861 μs	0.5637 μs	0.0309 μs	1.825 μs	1.877 μs	1.880 μs	1.17	0.03	1	0.5283	0.0172	8.65 KB	1.00
AgileMapper	2.246 μs	1.0926 μs	0.0599 μs	2.177 μs	2.274 μs	2.287 μs	1.41	0.04	1	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	4.876 μs	3.3357 μs	0.1828 μs	4.667 μs	4.953 μs	5.008 μs	1.00	0.05	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	4.991 μs	1.5994 μs	0.0877 μs	4.913 μs	4.975 μs	5.086 μs	1.02	0.04	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	5.668 μs	0.9552 μs	0.0524 μs	5.609 μs	5.686 μs	5.710 μs	1.16	0.04	1	1.7548	0.1068	28.7 KB	1.05
Mapster	5.190 μs	1.0847 μs	0.0595 μs	5.150 μs	5.162 μs	5.258 μs	1.07	0.04	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	4.714 μs	0.3895 μs	0.0213 μs	4.689 μs	4.724 μs	4.729 μs	0.97	0.03	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	4.488 μs	0.8720 μs	0.0478 μs	4.433 μs	4.510 μs	4.520 μs	0.92	0.03	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	15.76 μs	2.011 μs	0.110 μs	15.64 μs	15.78 μs	15.85 μs	1.00	0.01	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	15.22 μs	4.153 μs	0.228 μs	14.96 μs	15.32 μs	15.38 μs	0.97	0.01	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	19.26 μs	5.309 μs	0.291 μs	18.93 μs	19.41 μs	19.46 μs	1.22	0.02	1	5.7678	1.4343	94.34 KB	1.10
Mapster	15.12 μs	0.449 μs	0.025 μs	15.09 μs	15.12 μs	15.14 μs	0.96	0.01	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	16.74 μs	2.765 μs	0.152 μs	16.58 μs	16.75 μs	16.88 μs	1.06	0.01	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	17.27 μs	4.648 μs	0.255 μs	16.98 μs	17.37 μs	17.46 μs	1.10	0.02	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	1,125.117 μs	467.3572 μs	25.6174 μs	1,099.665 μs	1,124.789 μs	1,150.896 μs	1.000	0.03	3	3.9063	-	95.37 KB	1.00
AutoMapperStartup	351.703 μs	1,036.5123 μs	56.8147 μs	292.486 μs	356.858 μs	405.764 μs	0.313	0.04	2	5.8594	-	103.83 KB	1.09
MapsterStartup	1.947 μs	0.7150 μs	0.0392 μs	1.921 μs	1.927 μs	1.992 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	1.095 ms	1.169 ms	0.0641 ms	1.021 ms	1.124 ms	1.138 ms	1.00	0.07	1	5.8594	3.9063	96.16 KB	1.00
AutoMapper	3.743 ms	3.211 ms	0.1760 ms	3.548 ms	3.790 ms	3.891 ms	3.43	0.23	3	15.6250	7.8125	309.23 KB	3.22
Mapster	2.326 ms	6.218 ms	0.3408 ms	2.038 ms	2.239 ms	2.702 ms	2.13	0.29	2	42.9688	19.5313	759.26 KB	7.90

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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 '*'