chore: update benchmark results in README

[cloud-hai-vo]

Automated benchmark update from CI run #186.

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📊 Benchmark Results

Generated: 2026-05-22 14:30 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	15.91 ns	2.912 ns	0.160 ns	15.74 ns	15.92 ns	16.06 ns	1.00	0.01	1	0.0048	80 B	1.00
EggMapper	25.54 ns	5.883 ns	0.322 ns	25.19 ns	25.64 ns	25.81 ns	1.61	0.02	2	0.0048	80 B	1.00
AutoMapper	87.99 ns	6.250 ns	0.343 ns	87.65 ns	87.97 ns	88.34 ns	5.53	0.05	3	0.0048	80 B	1.00
Mapster	28.18 ns	16.045 ns	0.879 ns	27.17 ns	28.69 ns	28.70 ns	1.77	0.05	2	0.0048	80 B	1.00
MapperlyMap	15.21 ns	2.703 ns	0.148 ns	15.06 ns	15.23 ns	15.35 ns	0.96	0.01	1	0.0048	80 B	1.00
AgileMapper	496.14 ns	5.170 ns	0.283 ns	495.90 ns	496.07 ns	496.46 ns	31.20	0.27	4	0.0200	344 B	4.30
EggMapperGenerator	15.35 ns	3.757 ns	0.206 ns	15.15 ns	15.33 ns	15.56 ns	0.96	0.01	1	0.0048	80 B	1.00
EggMapperClassMapper	15.89 ns	5.513 ns	0.302 ns	15.54 ns	16.06 ns	16.07 ns	1.00	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	19.51 ns	7.440 ns	0.408 ns	19.04 ns	19.72 ns	19.77 ns	1.00	0.03	1	0.0048	80 B	1.00
EggMap	32.09 ns	4.549 ns	0.249 ns	31.81 ns	32.16 ns	32.30 ns	1.65	0.03	3	0.0048	80 B	1.00
AutoMapper	91.48 ns	7.969 ns	0.437 ns	90.97 ns	91.70 ns	91.75 ns	4.69	0.09	4	0.0048	80 B	1.00
Mapster	36.71 ns	3.140 ns	0.172 ns	36.55 ns	36.69 ns	36.89 ns	1.88	0.04	3	0.0048	80 B	1.00
MapperlyMap	25.53 ns	9.371 ns	0.514 ns	24.97 ns	25.64 ns	25.98 ns	1.31	0.03	2	0.0062	104 B	1.30
AgileMapper	548.17 ns	21.275 ns	1.166 ns	546.99 ns	548.19 ns	549.32 ns	28.10	0.52	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	55.23 ns	24.29 ns	1.331 ns	54.26 ns	54.69 ns	56.75 ns	1.00	0.03	1	0.0162	272 B	1.00
EggMapper	68.31 ns	22.42 ns	1.229 ns	67.30 ns	67.95 ns	69.67 ns	1.24	0.03	2	0.0162	272 B	1.00
AutoMapper	124.65 ns	11.56 ns	0.633 ns	123.92 ns	124.94 ns	125.08 ns	2.26	0.05	3	0.0162	272 B	1.00
Mapster	66.98 ns	24.48 ns	1.342 ns	65.53 ns	67.23 ns	68.17 ns	1.21	0.03	2	0.0162	272 B	1.00
MapperlyMap	52.15 ns	34.50 ns	1.891 ns	50.29 ns	52.09 ns	54.07 ns	0.94	0.04	1	0.0162	272 B	1.00
AgileMapper	538.89 ns	27.91 ns	1.530 ns	537.93 ns	538.08 ns	540.65 ns	9.76	0.20	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	75.49 ns	40.30 ns	2.209 ns	72.94 ns	76.65 ns	76.88 ns	1.00	0.04	1	0.0191	320 B	1.00
EggMapper	100.76 ns	43.87 ns	2.405 ns	97.99 ns	102.00 ns	102.30 ns	1.34	0.04	1	0.0191	320 B	1.00
AutoMapper	157.01 ns	25.25 ns	1.384 ns	155.65 ns	156.94 ns	158.42 ns	2.08	0.06	2	0.0196	328 B	1.02
Mapster	88.89 ns	14.07 ns	0.771 ns	88.01 ns	89.19 ns	89.45 ns	1.18	0.03	1	0.0191	320 B	1.00
MapperlyMap	72.89 ns	12.44 ns	0.682 ns	72.34 ns	72.68 ns	73.66 ns	0.97	0.03	1	0.0191	320 B	1.00
AgileMapper	593.46 ns	41.17 ns	2.256 ns	590.86 ns	594.69 ns	594.84 ns	7.87	0.20	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	1.912 μs	1.0027 μs	0.0550 μs	1.863 μs	1.903 μs	1.971 μs	1.00	0.04	1	0.5283	0.0172	8.65 KB	1.00
EggMapper	1.840 μs	0.7015 μs	0.0385 μs	1.814 μs	1.821 μs	1.884 μs	0.96	0.03	1	0.5283	0.0172	8.65 KB	1.00
AutoMapper	2.485 μs	1.3098 μs	0.0718 μs	2.414 μs	2.484 μs	2.557 μs	1.30	0.05	2	0.6065	0.0191	9.95 KB	1.15
Mapster	1.870 μs	0.7057 μs	0.0387 μs	1.826 μs	1.890 μs	1.895 μs	0.98	0.03	1	0.5283	0.0172	8.65 KB	1.00
MapperlyMap	1.874 μs	0.8853 μs	0.0485 μs	1.818 μs	1.893 μs	1.909 μs	0.98	0.03	1	0.5283	0.0172	8.65 KB	1.00
AgileMapper	2.695 μs	1.0504 μs	0.0576 μs	2.661 μs	2.663 μs	2.762 μs	1.41	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	5.322 μs	1.2928 μs	0.0709 μs	5.254 μs	5.316 μs	5.395 μs	1.00	0.02	1	1.6708	0.0916	27.4 KB	1.00
EggMapper	5.844 μs	1.3005 μs	0.0713 μs	5.770 μs	5.850 μs	5.912 μs	1.10	0.02	1	1.6708	0.0916	27.4 KB	1.00
AutoMapper	6.803 μs	0.9968 μs	0.0546 μs	6.741 μs	6.824 μs	6.844 μs	1.28	0.02	1	1.7548	0.1068	28.7 KB	1.05
Mapster	5.908 μs	2.0751 μs	0.1137 μs	5.837 μs	5.848 μs	6.039 μs	1.11	0.02	1	1.6708	0.0916	27.4 KB	1.00
MapperlyMap	5.618 μs	2.3189 μs	0.1271 μs	5.504 μs	5.595 μs	5.755 μs	1.06	0.02	1	1.6785	0.0992	27.42 KB	1.00
AgileMapper	5.472 μs	1.7412 μs	0.0954 μs	5.375 μs	5.475 μs	5.566 μs	1.03	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	17.46 μs	1.509 μs	0.083 μs	17.41 μs	17.41 μs	17.55 μs	1.00	0.01	1	5.2490	1.3123	85.99 KB	1.00
EggMapper	18.19 μs	7.941 μs	0.435 μs	17.68 μs	18.41 μs	18.47 μs	1.04	0.02	1	5.2490	1.3123	85.99 KB	1.00
AutoMapper	21.80 μs	7.687 μs	0.421 μs	21.49 μs	21.64 μs	22.28 μs	1.25	0.02	1	5.7678	1.4343	94.34 KB	1.10
Mapster	18.36 μs	1.896 μs	0.104 μs	18.26 μs	18.35 μs	18.47 μs	1.05	0.01	1	5.2490	1.3123	85.99 KB	1.00
MapperlyMap	19.86 μs	5.767 μs	0.316 μs	19.59 μs	19.78 μs	20.20 μs	1.14	0.02	1	5.2490	1.2817	86.02 KB	1.00
AgileMapper	21.20 μs	11.870 μs	0.651 μs	20.48 μs	21.38 μs	21.75 μs	1.21	0.03	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	1,349.001 μs	1,544.8481 μs	84.6783 μs	1,268.218 μs	1,341.687 μs	1,437.100 μs	1.003	0.08	3	5.8594	3.9063	95.98 KB	1.00
AutoMapperStartup	442.545 μs	409.6929 μs	22.4567 μs	424.385 μs	435.594 μs	467.655 μs	0.329	0.02	2	5.8594	-	104.11 KB	1.08
MapsterStartup	2.693 μs	0.9548 μs	0.0523 μs	2.632 μs	2.717 μs	2.728 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	1.327 ms	1.510 ms	0.0828 ms	1.267 ms	1.292 ms	1.421 ms	1.00	0.08	1	5.8594	3.9063	95.99 KB	1.00
AutoMapper	4.225 ms	9.960 ms	0.5459 ms	3.644 ms	4.303 ms	4.727 ms	3.19	0.39	2	15.6250	7.8125	310.23 KB	3.23
Mapster	4.379 ms	11.612 ms	0.6365 ms	3.669 ms	4.572 ms	4.897 ms	3.31	0.45	2	39.0625	15.6250	756.58 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 '*'