chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #176.

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📊 Benchmark Results

Generated: 2026-05-02 04:59 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	15.85 ns	0.952 ns	0.052 ns	15.79 ns	15.86 ns	15.89 ns	1.00	0.00	1	0.0048	80 B	1.00
EggMapper	27.89 ns	5.653 ns	0.310 ns	27.57 ns	27.91 ns	28.19 ns	1.76	0.02	2	0.0048	80 B	1.00
AutoMapper	81.17 ns	1.747 ns	0.096 ns	81.09 ns	81.15 ns	81.28 ns	5.12	0.02	3	0.0048	80 B	1.00
Mapster	29.07 ns	0.685 ns	0.038 ns	29.03 ns	29.09 ns	29.10 ns	1.83	0.01	2	0.0048	80 B	1.00
MapperlyMap	16.01 ns	1.390 ns	0.076 ns	15.94 ns	16.00 ns	16.09 ns	1.01	0.01	1	0.0048	80 B	1.00
AgileMapper	331.57 ns	13.166 ns	0.722 ns	331.07 ns	331.25 ns	332.40 ns	20.93	0.07	4	0.0205	344 B	4.30
EggMapperGenerator	16.87 ns	6.699 ns	0.367 ns	16.50 ns	16.89 ns	17.23 ns	1.06	0.02	1	0.0048	80 B	1.00
EggMapperClassMapper	16.71 ns	0.734 ns	0.040 ns	16.67 ns	16.71 ns	16.75 ns	1.05	0.00	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	20.27 ns	2.477 ns	0.136 ns	20.16 ns	20.22 ns	20.42 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMap	30.63 ns	1.994 ns	0.109 ns	30.54 ns	30.61 ns	30.75 ns	1.51	0.01	2	0.0048	80 B	1.00
AutoMapper	82.20 ns	2.233 ns	0.122 ns	82.12 ns	82.14 ns	82.34 ns	4.06	0.02	3	0.0048	80 B	1.00
Mapster	35.56 ns	0.699 ns	0.038 ns	35.52 ns	35.55 ns	35.60 ns	1.75	0.01	2	0.0048	80 B	1.00
MapperlyMap	25.59 ns	0.504 ns	0.028 ns	25.56 ns	25.60 ns	25.61 ns	1.26	0.01	2	0.0062	104 B	1.30
AgileMapper	341.29 ns	63.398 ns	3.475 ns	338.04 ns	340.89 ns	344.95 ns	16.84	0.18	4	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	64.04 ns	7.893 ns	0.433 ns	63.57 ns	64.14 ns	64.42 ns	1.00	0.01	1	0.0162	272 B	1.00
EggMapper	71.33 ns	5.521 ns	0.303 ns	71.02 ns	71.35 ns	71.62 ns	1.11	0.01	1	0.0162	272 B	1.00
AutoMapper	110.94 ns	5.818 ns	0.319 ns	110.58 ns	111.12 ns	111.13 ns	1.73	0.01	2	0.0162	272 B	1.00
Mapster	74.00 ns	9.894 ns	0.542 ns	73.58 ns	73.80 ns	74.61 ns	1.16	0.01	1	0.0162	272 B	1.00
MapperlyMap	54.44 ns	4.759 ns	0.261 ns	54.17 ns	54.45 ns	54.70 ns	0.85	0.01	1	0.0162	272 B	1.00
AgileMapper	355.30 ns	6.241 ns	0.342 ns	354.97 ns	355.29 ns	355.65 ns	5.55	0.03	3	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	81.49 ns	23.972 ns	1.314 ns	79.99 ns	82.07 ns	82.42 ns	1.00	0.02	1	0.0191	320 B	1.00
EggMapper	103.73 ns	3.297 ns	0.181 ns	103.61 ns	103.64 ns	103.94 ns	1.27	0.02	1	0.0191	320 B	1.00
AutoMapper	155.28 ns	20.028 ns	1.098 ns	154.26 ns	155.14 ns	156.45 ns	1.91	0.03	2	0.0196	328 B	1.02
Mapster	103.05 ns	12.356 ns	0.677 ns	102.48 ns	102.88 ns	103.80 ns	1.26	0.02	1	0.0191	320 B	1.00
MapperlyMap	87.39 ns	9.107 ns	0.499 ns	86.92 ns	87.33 ns	87.91 ns	1.07	0.02	1	0.0191	320 B	1.00
AgileMapper	416.93 ns	33.093 ns	1.814 ns	415.01 ns	417.18 ns	418.61 ns	5.12	0.07	3	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	2.021 μs	1.6778 μs	0.0920 μs	1.915 μs	2.068 μs	2.080 μs	1.00	0.06	1	0.5264	0.0153	8.65 KB	1.00
EggMapper	2.137 μs	0.6968 μs	0.0382 μs	2.096 μs	2.144 μs	2.172 μs	1.06	0.05	1	0.5264	0.0153	8.65 KB	1.00
AutoMapper	2.691 μs	2.0362 μs	0.1116 μs	2.602 μs	2.654 μs	2.816 μs	1.33	0.07	1	0.6065	0.0191	9.95 KB	1.15
Mapster	2.301 μs	0.6461 μs	0.0354 μs	2.280 μs	2.281 μs	2.342 μs	1.14	0.05	1	0.5264	0.0153	8.65 KB	1.00
MapperlyMap	2.175 μs	1.1499 μs	0.0630 μs	2.104 μs	2.196 μs	2.225 μs	1.08	0.05	1	0.5264	0.0153	8.65 KB	1.00
AgileMapper	2.766 μs	0.4826 μs	0.0265 μs	2.736 μs	2.781 μs	2.781 μs	1.37	0.06	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	6.375 μs	1.5930 μs	0.0873 μs	6.276 μs	6.409 μs	6.440 μs	1.00	0.02	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	7.468 μs	1.4490 μs	0.0794 μs	7.376 μs	7.512 μs	7.516 μs	1.17	0.02	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	7.709 μs	2.4363 μs	0.1335 μs	7.614 μs	7.651 μs	7.861 μs	1.21	0.02	1	1.7548	0.1068	28.7 KB	1.05
Mapster	7.243 μs	1.6157 μs	0.0886 μs	7.143 μs	7.276 μs	7.310 μs	1.14	0.02	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	6.260 μs	2.2466 μs	0.1231 μs	6.124 μs	6.293 μs	6.364 μs	0.98	0.02	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	6.380 μs	0.2886 μs	0.0158 μs	6.366 μs	6.378 μs	6.397 μs	1.00	0.01	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	20.23 μs	4.400 μs	0.241 μs	20.01 μs	20.18 μs	20.49 μs	1.00	0.01	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	21.28 μs	8.156 μs	0.447 μs	20.82 μs	21.31 μs	21.71 μs	1.05	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	25.65 μs	3.923 μs	0.215 μs	25.52 μs	25.54 μs	25.90 μs	1.27	0.02	1	5.7678	1.4343	94.34 KB	1.10
Mapster	21.47 μs	8.505 μs	0.466 μs	20.94 μs	21.65 μs	21.82 μs	1.06	0.02	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	22.10 μs	1.357 μs	0.074 μs	22.03 μs	22.08 μs	22.18 μs	1.09	0.01	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	23.67 μs	1.383 μs	0.076 μs	23.59 μs	23.69 μs	23.74 μs	1.17	0.01	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	1,351.579 μs	1,541.394 μs	84.4890 μs	1,298.326 μs	1,307.413 μs	1,448.997 μs	1.003	0.08	3	3.9063	1.9531	95.16 KB	1.00
AutoMapperStartup	438.191 μs	1,338.267 μs	73.3549 μs	392.204 μs	399.583 μs	522.787 μs	0.325	0.05	2	5.8594	-	104.11 KB	1.09
MapsterStartup	2.544 μs	1.377 μs	0.0755 μs	2.473 μs	2.537 μs	2.623 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	1.349 ms	1.191 ms	0.0653 ms	1.293 ms	1.333 ms	1.420 ms	1.00	0.06	1	5.8594	3.9063	96.22 KB	1.00
AutoMapper	4.329 ms	10.067 ms	0.5518 ms	3.856 ms	4.195 ms	4.935 ms	3.21	0.38	2	15.6250	7.8125	310.19 KB	3.22
Mapster	4.484 ms	6.025 ms	0.3302 ms	4.108 ms	4.617 ms	4.727 ms	3.33	0.25	2	39.0625	15.6250	758.46 KB	7.88

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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 '*'