chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #183.

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📊 Benchmark Results

Generated: 2026-05-02 09:35 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	16.56 ns	6.188 ns	0.339 ns	16.22 ns	16.57 ns	16.89 ns	1.00	0.03	1	0.0048	80 B	1.00
EggMapper	28.34 ns	5.515 ns	0.302 ns	28.04 ns	28.35 ns	28.64 ns	1.71	0.03	2	0.0048	80 B	1.00
AutoMapper	78.03 ns	1.457 ns	0.080 ns	77.98 ns	77.99 ns	78.12 ns	4.71	0.08	3	0.0048	80 B	1.00
Mapster	30.16 ns	12.292 ns	0.674 ns	29.66 ns	29.90 ns	30.93 ns	1.82	0.05	2	0.0048	80 B	1.00
MapperlyMap	16.96 ns	6.550 ns	0.359 ns	16.55 ns	17.10 ns	17.23 ns	1.02	0.03	1	0.0048	80 B	1.00
AgileMapper	335.06 ns	4.262 ns	0.234 ns	334.92 ns	334.93 ns	335.33 ns	20.24	0.36	4	0.0205	344 B	4.30
EggMapperGenerator	17.55 ns	4.653 ns	0.255 ns	17.27 ns	17.61 ns	17.77 ns	1.06	0.02	1	0.0048	80 B	1.00
EggMapperClassMapper	18.52 ns	2.348 ns	0.129 ns	18.38 ns	18.54 ns	18.64 ns	1.12	0.02	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	20.62 ns	2.793 ns	0.153 ns	20.47 ns	20.63 ns	20.77 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMap	32.85 ns	20.932 ns	1.147 ns	32.05 ns	32.34 ns	34.17 ns	1.59	0.05	2	0.0048	80 B	1.00
AutoMapper	83.54 ns	7.134 ns	0.391 ns	83.28 ns	83.34 ns	83.99 ns	4.05	0.03	3	0.0048	80 B	1.00
Mapster	36.22 ns	4.587 ns	0.251 ns	36.06 ns	36.09 ns	36.51 ns	1.76	0.02	2	0.0048	80 B	1.00
MapperlyMap	27.22 ns	3.346 ns	0.183 ns	27.02 ns	27.26 ns	27.37 ns	1.32	0.01	2	0.0062	104 B	1.30
AgileMapper	332.47 ns	33.886 ns	1.857 ns	331.17 ns	331.63 ns	334.59 ns	16.12	0.13	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	60.00 ns	15.141 ns	0.830 ns	59.05 ns	60.37 ns	60.57 ns	1.00	0.02	1	0.0162	272 B	1.00
EggMapper	73.51 ns	7.625 ns	0.418 ns	73.27 ns	73.28 ns	74.00 ns	1.23	0.02	1	0.0162	272 B	1.00
AutoMapper	112.15 ns	16.524 ns	0.906 ns	111.42 ns	111.87 ns	113.16 ns	1.87	0.03	2	0.0162	272 B	1.00
Mapster	75.24 ns	28.610 ns	1.568 ns	73.43 ns	76.11 ns	76.18 ns	1.25	0.03	1	0.0162	272 B	1.00
MapperlyMap	61.42 ns	3.956 ns	0.217 ns	61.18 ns	61.53 ns	61.57 ns	1.02	0.01	1	0.0162	272 B	1.00
AgileMapper	374.34 ns	8.832 ns	0.484 ns	373.92 ns	374.24 ns	374.87 ns	6.24	0.08	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	80.57 ns	26.893 ns	1.474 ns	78.90 ns	81.09 ns	81.70 ns	1.00	0.02	1	0.0191	320 B	1.00
EggMapper	105.68 ns	5.528 ns	0.303 ns	105.46 ns	105.56 ns	106.03 ns	1.31	0.02	1	0.0191	320 B	1.00
AutoMapper	151.35 ns	14.156 ns	0.776 ns	150.81 ns	150.99 ns	152.24 ns	1.88	0.03	2	0.0196	328 B	1.02
Mapster	101.49 ns	26.478 ns	1.451 ns	99.89 ns	101.88 ns	102.71 ns	1.26	0.03	1	0.0191	320 B	1.00
MapperlyMap	84.77 ns	19.715 ns	1.081 ns	84.03 ns	84.28 ns	86.01 ns	1.05	0.02	1	0.0191	320 B	1.00
AgileMapper	422.99 ns	177.653 ns	9.738 ns	413.09 ns	423.32 ns	432.56 ns	5.25	0.13	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	2.025 μs	1.2151 μs	0.0666 μs	1.971 μs	2.006 μs	2.100 μs	1.00	0.04	1	0.5264	0.0153	8.65 KB	1.00
EggMapper	2.150 μs	1.5231 μs	0.0835 μs	2.061 μs	2.164 μs	2.226 μs	1.06	0.05	1	0.5264	0.0153	8.65 KB	1.00
AutoMapper	2.553 μs	0.8315 μs	0.0456 μs	2.504 μs	2.559 μs	2.594 μs	1.26	0.04	1	0.6065	0.0191	9.95 KB	1.15
Mapster	2.046 μs	0.6996 μs	0.0383 μs	2.007 μs	2.047 μs	2.084 μs	1.01	0.03	1	0.5264	0.0153	8.65 KB	1.00
MapperlyMap	2.240 μs	0.5902 μs	0.0323 μs	2.204 μs	2.248 μs	2.267 μs	1.11	0.03	1	0.5264	0.0153	8.65 KB	1.00
AgileMapper	3.084 μs	0.2639 μs	0.0145 μs	3.069 μs	3.085 μs	3.098 μs	1.52	0.04	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	6.297 μs	0.8301 μs	0.0455 μs	6.252 μs	6.296 μs	6.343 μs	1.00	0.01	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	7.077 μs	2.5824 μs	0.1416 μs	6.925 μs	7.102 μs	7.205 μs	1.12	0.02	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	8.146 μs	1.6843 μs	0.0923 μs	8.041 μs	8.182 μs	8.215 μs	1.29	0.02	1	1.7548	0.1068	28.7 KB	1.05
Mapster	7.520 μs	2.2581 μs	0.1238 μs	7.412 μs	7.494 μs	7.655 μs	1.19	0.02	1	1.6632	0.0916	27.4 KB	1.00
MapperlyMap	7.259 μs	0.9384 μs	0.0514 μs	7.212 μs	7.251 μs	7.314 μs	1.15	0.01	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.974 μs	3.8573 μs	0.2114 μs	5.742 μs	6.025 μs	6.156 μs	0.95	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	25.61 μs	9.753 μs	0.535 μs	25.20 μs	25.41 μs	26.22 μs	1.00	0.03	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	23.49 μs	10.610 μs	0.582 μs	22.84 μs	23.68 μs	23.96 μs	0.92	0.03	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	27.36 μs	14.618 μs	0.801 μs	26.44 μs	27.73 μs	27.90 μs	1.07	0.03	1	5.7678	1.4343	94.34 KB	1.10
Mapster	22.91 μs	3.016 μs	0.165 μs	22.75 μs	22.91 μs	23.08 μs	0.89	0.02	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	23.58 μs	6.089 μs	0.334 μs	23.33 μs	23.47 μs	23.96 μs	0.92	0.02	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	25.72 μs	6.206 μs	0.340 μs	25.47 μs	25.58 μs	26.10 μs	1.00	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	1,407.678 μs	2,410.364 μs	132.1202 μs	1,256.128 μs	1,468.287 μs	1,498.620 μs	1.006	0.12	3	3.9063	1.9531	95.18 KB	1.00
AutoMapperStartup	408.211 μs	692.071 μs	37.9347 μs	371.559 μs	405.763 μs	447.310 μs	0.292	0.03	2	5.8594	-	104.67 KB	1.10
MapsterStartup	3.123 μs	2.608 μs	0.1430 μs	3.013 μs	3.072 μs	3.285 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	1.358 ms	1.771 ms	0.0971 ms	1.246 ms	1.405 ms	1.422 ms	1.00	0.09	1	3.9063	1.9531	95.39 KB	1.00
AutoMapper	4.185 ms	11.009 ms	0.6034 ms	3.587 ms	4.175 ms	4.794 ms	3.09	0.44	2	15.6250	7.8125	310.28 KB	3.25
Mapster	4.411 ms	8.539 ms	0.4680 ms	3.874 ms	4.626 ms	4.733 ms	3.26	0.37	2	46.8750	15.6250	765.62 KB	8.03

---

📝 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 '*'