chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #132.

[github-actions]

📊 Benchmark Results

Generated: 2026-03-27 04:23 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	16.01 ns	5.007 ns	0.274 ns	15.69 ns	16.13 ns	16.20 ns	1.00	0.02	1	0.0048	80 B	1.00
EggMapper	26.05 ns	5.957 ns	0.327 ns	25.68 ns	26.23 ns	26.25 ns	1.63	0.03	2	0.0048	80 B	1.00
AutoMapper	84.56 ns	2.563 ns	0.140 ns	84.40 ns	84.62 ns	84.66 ns	5.28	0.08	3	0.0048	80 B	1.00
Mapster	29.41 ns	4.893 ns	0.268 ns	29.17 ns	29.36 ns	29.70 ns	1.84	0.03	2	0.0048	80 B	1.00
MapperlyMap	15.92 ns	11.150 ns	0.611 ns	15.24 ns	16.08 ns	16.44 ns	0.99	0.04	1	0.0048	80 B	1.00
AgileMapper	508.58 ns	73.364 ns	4.021 ns	505.94 ns	506.59 ns	513.20 ns	31.78	0.52	4	0.0200	344 B	4.30
EggMapperGenerator	15.80 ns	3.165 ns	0.173 ns	15.67 ns	15.73 ns	16.00 ns	0.99	0.02	1	0.0048	80 B	1.00
EggMapperClassMapper	15.54 ns	1.308 ns	0.072 ns	15.46 ns	15.54 ns	15.60 ns	0.97	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	20.27 ns	6.786 ns	0.372 ns	19.86 ns	20.35 ns	20.59 ns	1.00	0.02	1	0.0048	80 B	1.00
EggMap	30.84 ns	3.574 ns	0.196 ns	30.62 ns	30.90 ns	30.99 ns	1.52	0.03	3	0.0048	80 B	1.00
AutoMapper	91.37 ns	25.396 ns	1.392 ns	90.40 ns	90.75 ns	92.97 ns	4.51	0.09	4	0.0048	80 B	1.00
Mapster	36.95 ns	3.788 ns	0.208 ns	36.72 ns	37.03 ns	37.11 ns	1.82	0.03	3	0.0048	80 B	1.00
MapperlyMap	24.62 ns	3.449 ns	0.189 ns	24.41 ns	24.68 ns	24.77 ns	1.21	0.02	2	0.0062	104 B	1.30
AgileMapper	519.72 ns	33.343 ns	1.828 ns	517.92 ns	519.68 ns	521.57 ns	25.65	0.42	5	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	57.77 ns	15.983 ns	0.876 ns	56.76 ns	58.28 ns	58.28 ns	1.00	0.02	1	0.0162	272 B	1.00
EggMapper	68.04 ns	10.367 ns	0.568 ns	67.38 ns	68.36 ns	68.37 ns	1.18	0.02	1	0.0162	272 B	1.00
AutoMapper	123.81 ns	13.307 ns	0.729 ns	123.01 ns	123.99 ns	124.44 ns	2.14	0.03	2	0.0162	272 B	1.00
Mapster	69.35 ns	23.320 ns	1.278 ns	67.88 ns	70.07 ns	70.12 ns	1.20	0.02	1	0.0162	272 B	1.00
MapperlyMap	52.25 ns	11.218 ns	0.615 ns	51.58 ns	52.38 ns	52.79 ns	0.90	0.02	1	0.0162	272 B	1.00
AgileMapper	513.19 ns	2.224 ns	0.122 ns	513.05 ns	513.25 ns	513.27 ns	8.88	0.12	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	70.95 ns	17.974 ns	0.985 ns	69.85 ns	71.27 ns	71.74 ns	1.00	0.02	1	0.0191	320 B	1.00
EggMapper	107.21 ns	15.888 ns	0.871 ns	106.69 ns	106.72 ns	108.21 ns	1.51	0.02	2	0.0191	320 B	1.00
AutoMapper	159.48 ns	30.605 ns	1.678 ns	158.29 ns	158.75 ns	161.40 ns	2.25	0.03	3	0.0196	328 B	1.02
Mapster	93.39 ns	7.412 ns	0.406 ns	92.99 ns	93.39 ns	93.80 ns	1.32	0.02	2	0.0191	320 B	1.00
MapperlyMap	89.89 ns	24.704 ns	1.354 ns	88.99 ns	89.24 ns	91.45 ns	1.27	0.02	2	0.0191	320 B	1.00
AgileMapper	579.81 ns	35.503 ns	1.946 ns	578.58 ns	578.79 ns	582.05 ns	8.17	0.10	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	1.787 μs	0.2314 μs	0.0127 μs	1.775 μs	1.785 μs	1.800 μs	1.00	0.01	1	0.5283	0.0172	8.65 KB	1.00
EggMapper	1.658 μs	0.2837 μs	0.0155 μs	1.640 μs	1.666 μs	1.668 μs	0.93	0.01	1	0.5283	0.0172	8.65 KB	1.00
AutoMapper	2.287 μs	0.4824 μs	0.0264 μs	2.262 μs	2.286 μs	2.315 μs	1.28	0.02	2	0.6065	0.0191	9.95 KB	1.15
Mapster	1.782 μs	0.1593 μs	0.0087 μs	1.776 μs	1.777 μs	1.792 μs	1.00	0.01	1	0.5283	0.0172	8.65 KB	1.00
MapperlyMap	1.891 μs	0.6323 μs	0.0347 μs	1.856 μs	1.892 μs	1.925 μs	1.06	0.02	1	0.5283	0.0172	8.65 KB	1.00
AgileMapper	2.643 μs	0.1338 μs	0.0073 μs	2.639 μs	2.639 μs	2.652 μs	1.48	0.01	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	5.532 μs	0.4694 μs	0.0257 μs	5.505 μs	5.534 μs	5.557 μs	1.00	0.01	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	5.908 μs	3.2619 μs	0.1788 μs	5.702 μs	5.997 μs	6.024 μs	1.07	0.03	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	6.963 μs	1.0369 μs	0.0568 μs	6.908 μs	6.958 μs	7.022 μs	1.26	0.01	1	1.7548	0.1068	28.7 KB	1.05
Mapster	6.163 μs	1.2484 μs	0.0684 μs	6.091 μs	6.169 μs	6.227 μs	1.11	0.01	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	5.425 μs	1.3921 μs	0.0763 μs	5.343 μs	5.438 μs	5.494 μs	0.98	0.01	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.283 μs	1.0585 μs	0.0580 μs	5.240 μs	5.261 μs	5.349 μs	0.96	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	18.24 μs	4.894 μs	0.268 μs	17.98 μs	18.24 μs	18.52 μs	1.00	0.02	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	17.56 μs	4.980 μs	0.273 μs	17.28 μs	17.56 μs	17.83 μs	0.96	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	22.91 μs	5.562 μs	0.305 μs	22.56 μs	23.06 μs	23.12 μs	1.26	0.02	1	5.7678	1.4343	94.34 KB	1.10
Mapster	19.16 μs	2.916 μs	0.160 μs	18.98 μs	19.19 μs	19.30 μs	1.05	0.02	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	19.94 μs	2.323 μs	0.127 μs	19.82 μs	19.94 μs	20.07 μs	1.09	0.02	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	22.04 μs	2.600 μs	0.143 μs	21.90 μs	22.02 μs	22.18 μs	1.21	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	1,327.471 μs	850.1570 μs	46.6000 μs	1,289.298 μs	1,313.714 μs	1,379.401 μs	1.001	0.04	3	5.8594	-	95.62 KB	1.00
AutoMapperStartup	428.081 μs	235.2054 μs	12.8924 μs	414.024 μs	430.866 μs	439.354 μs	0.323	0.01	2	5.8594	-	104.2 KB	1.09
MapsterStartup	2.593 μs	0.3758 μs	0.0206 μs	2.578 μs	2.585 μs	2.616 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	1.328 ms	1.611 ms	0.0883 ms	1.229 ms	1.355 ms	1.400 ms	1.00	0.08	1	5.8594	3.9063	96.44 KB	1.00
AutoMapper	3.956 ms	9.406 ms	0.5156 ms	3.595 ms	3.727 ms	4.546 ms	2.99	0.38	2	15.6250	7.8125	310.14 KB	3.22
Mapster	4.336 ms	10.191 ms	0.5586 ms	3.810 ms	4.275 ms	4.923 ms	3.27	0.41	2	39.0625	15.6250	758.19 KB	7.86

---

📝 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 '*'