chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #193.

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📊 Benchmark Results

Generated: 2026-09-15 14:04 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	14.95 ns	4.705 ns	0.258 ns	14.67 ns	15.01 ns	15.18 ns	1.00	0.02	1	0.0048	80 B	1.00
EggMapper	25.79 ns	5.188 ns	0.284 ns	25.55 ns	25.71 ns	26.10 ns	1.73	0.03	2	0.0048	80 B	1.00
AutoMapper	81.98 ns	6.106 ns	0.335 ns	81.60 ns	82.11 ns	82.23 ns	5.48	0.08	3	0.0048	80 B	1.00
Mapster	27.71 ns	3.054 ns	0.167 ns	27.61 ns	27.62 ns	27.91 ns	1.85	0.03	2	0.0048	80 B	1.00
MapperlyMap	14.82 ns	2.553 ns	0.140 ns	14.67 ns	14.84 ns	14.95 ns	0.99	0.02	1	0.0048	80 B	1.00
AgileMapper	487.32 ns	130.996 ns	7.180 ns	482.34 ns	484.07 ns	495.55 ns	32.60	0.64	4	0.0200	344 B	4.30
EggMapperGenerator	15.29 ns	4.355 ns	0.239 ns	15.02 ns	15.41 ns	15.45 ns	1.02	0.02	1	0.0048	80 B	1.00
EggMapperClassMapper	15.03 ns	6.739 ns	0.369 ns	14.66 ns	15.02 ns	15.40 ns	1.01	0.03	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	19.09 ns	9.496 ns	0.520 ns	18.60 ns	19.04 ns	19.63 ns	1.00	0.03	1	0.0048	80 B	1.00
EggMap	29.96 ns	2.103 ns	0.115 ns	29.83 ns	30.00 ns	30.06 ns	1.57	0.04	3	0.0048	80 B	1.00
AutoMapper	86.94 ns	4.256 ns	0.233 ns	86.67 ns	87.05 ns	87.09 ns	4.56	0.11	5	0.0048	80 B	1.00
Mapster	36.82 ns	13.567 ns	0.744 ns	35.98 ns	37.07 ns	37.40 ns	1.93	0.06	4	0.0048	80 B	1.00
MapperlyMap	24.73 ns	4.238 ns	0.232 ns	24.48 ns	24.78 ns	24.93 ns	1.30	0.03	2	0.0062	104 B	1.30
AgileMapper	541.57 ns	67.310 ns	3.689 ns	539.10 ns	539.80 ns	545.81 ns	28.38	0.69	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	52.55 ns	4.470 ns	0.245 ns	52.32 ns	52.52 ns	52.81 ns	1.00	0.01	1	0.0162	272 B	1.00
EggMapper	68.97 ns	40.519 ns	2.221 ns	66.96 ns	68.61 ns	71.36 ns	1.31	0.04	2	0.0162	272 B	1.00
AutoMapper	123.86 ns	20.880 ns	1.144 ns	122.70 ns	123.89 ns	124.99 ns	2.36	0.02	3	0.0162	272 B	1.00
Mapster	65.98 ns	13.057 ns	0.716 ns	65.17 ns	66.23 ns	66.54 ns	1.26	0.01	2	0.0162	272 B	1.00
MapperlyMap	49.55 ns	10.178 ns	0.558 ns	49.00 ns	49.53 ns	50.12 ns	0.94	0.01	1	0.0162	272 B	1.00
AgileMapper	514.46 ns	35.171 ns	1.928 ns	512.24 ns	515.50 ns	515.65 ns	9.79	0.05	4	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	72.36 ns	38.62 ns	2.117 ns	70.13 ns	72.59 ns	74.35 ns	1.00	0.04	1	0.0191	320 B	1.00
EggMapper	97.77 ns	50.48 ns	2.767 ns	94.59 ns	99.17 ns	99.57 ns	1.35	0.05	2	0.0191	320 B	1.00
AutoMapper	155.75 ns	36.23 ns	1.986 ns	153.79 ns	155.69 ns	157.76 ns	2.15	0.06	3	0.0196	328 B	1.02
Mapster	89.11 ns	55.01 ns	3.015 ns	86.34 ns	88.67 ns	92.32 ns	1.23	0.05	2	0.0191	320 B	1.00
MapperlyMap	70.82 ns	27.50 ns	1.508 ns	69.83 ns	70.08 ns	72.56 ns	0.98	0.03	1	0.0191	320 B	1.00
AgileMapper	581.05 ns	117.26 ns	6.428 ns	575.23 ns	579.99 ns	587.95 ns	8.04	0.22	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	1.977 μs	0.7503 μs	0.0411 μs	1.937 μs	1.976 μs	2.019 μs	1.00	0.03	1	0.5264	0.0153	8.65 KB	1.00
EggMapper	1.922 μs	0.5421 μs	0.0297 μs	1.888 μs	1.939 μs	1.940 μs	0.97	0.02	1	0.5264	0.0153	8.65 KB	1.00
AutoMapper	2.631 μs	0.5449 μs	0.0299 μs	2.598 μs	2.639 μs	2.656 μs	1.33	0.03	2	0.6065	0.0191	9.95 KB	1.15
Mapster	1.925 μs	0.7211 μs	0.0395 μs	1.880 μs	1.940 μs	1.955 μs	0.97	0.02	1	0.5264	0.0153	8.65 KB	1.00
MapperlyMap	1.883 μs	0.8752 μs	0.0480 μs	1.830 μs	1.896 μs	1.924 μs	0.95	0.03	1	0.5264	0.0153	8.65 KB	1.00
AgileMapper	2.644 μs	0.7701 μs	0.0422 μs	2.607 μs	2.635 μs	2.690 μs	1.34	0.03	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	5.267 μs	1.842 μs	0.1010 μs	5.189 μs	5.231 μs	5.381 μs	1.00	0.02	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	5.771 μs	1.983 μs	0.1087 μs	5.677 μs	5.745 μs	5.890 μs	1.10	0.03	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	6.471 μs	2.923 μs	0.1602 μs	6.348 μs	6.413 μs	6.652 μs	1.23	0.03	1	1.7548	0.1068	28.7 KB	1.05
Mapster	6.057 μs	3.299 μs	0.1808 μs	5.913 μs	5.998 μs	6.260 μs	1.15	0.04	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	5.493 μs	1.839 μs	0.1008 μs	5.378 μs	5.536 μs	5.565 μs	1.04	0.02	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.295 μs	1.790 μs	0.0981 μs	5.182 μs	5.346 μs	5.357 μs	1.01	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	18.08 μs	4.284 μs	0.235 μs	17.81 μs	18.18 μs	18.24 μs	1.00	0.02	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	18.02 μs	3.970 μs	0.218 μs	17.89 μs	17.90 μs	18.27 μs	1.00	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	22.61 μs	1.543 μs	0.085 μs	22.52 μs	22.62 μs	22.69 μs	1.25	0.01	1	5.7678	1.4343	94.34 KB	1.10
Mapster	18.18 μs	4.120 μs	0.226 μs	18.02 μs	18.08 μs	18.44 μs	1.01	0.02	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	19.48 μs	1.796 μs	0.098 μs	19.42 μs	19.43 μs	19.60 μs	1.08	0.01	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	21.59 μs	1.451 μs	0.080 μs	21.52 μs	21.56 μs	21.68 μs	1.19	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	1,348.096 μs	2,379.9983 μs	130.4557 μs	1,198.142 μs	1,410.658 μs	1,435.487 μs	1.007	0.12	3	5.8594	3.9063	96.08 KB	1.00
AutoMapperStartup	463.848 μs	924.8130 μs	50.6921 μs	419.940 μs	452.280 μs	519.325 μs	0.346	0.04	2	5.8594	-	104.04 KB	1.08
MapsterStartup	2.630 μs	0.5154 μs	0.0282 μs	2.598 μs	2.639 μs	2.653 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	1.335 ms	1.579 ms	0.0865 ms	1.264 ms	1.309 ms	1.431 ms	1.00	0.08	1	5.8594	3.9063	96 KB	1.00
AutoMapper	4.056 ms	10.513 ms	0.5763 ms	3.490 ms	4.036 ms	4.642 ms	3.05	0.41	2	15.6250	7.8125	310.47 KB	3.23
Mapster	4.374 ms	10.211 ms	0.5597 ms	3.746 ms	4.555 ms	4.821 ms	3.29	0.41	2	39.0625	15.6250	757.68 KB	7.89

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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 '*'