CSharpPerformanceBenchmarks

Performance benchmarks for various C# scenarios. Run without debugging in release mode only. Needs VS 2022 / .NET 6

Results:

String Concatenation Vs String Builder Append Vs String Builder Append with Concatenation

Method	Mean	Error	StdDev	Median	Ratio	RatioSD	Gen 0	Allocated
GetFullStringNormally	8.648 μs	0.1722 μs	0.3518 μs	8.492 μs	1.00	0.00	29.8615	122 KB
GetFullStringWithStringBuilder	1.859 μs	0.0612 μs	0.1804 μs	1.818 μs	0.21	0.02	1.6918	7 KB
GetFullStringWithStringBuilderConcatenation	3.939 μs	0.1088 μs	0.3192 μs	4.005 μs	0.47	0.04	3.5286	14 KB

Concurrent Dictionary AddorUpdate vs Custom Dictionary with Lock

Method	Mean	Error	StdDev	Median	Max	Min	Ratio	RatioSD	Completed Work Items	Lock Contentions	Allocated
AddOrUpdateThreadSafeDictionary	150.63 μs	7.891 μs	23.018 μs	155.10 μs	199.00 μs	76.30 μs	1.00	0.00	7.0000	-	4 KB
AddOrUpdateConcurrentDictionary	77.85 μs	1.541 μs	3.416 μs	76.60 μs	87.90 μs	71.90 μs	0.53	0.09	8.0000	-	4 KB
AddOrUpdateAllNewKeysThreadSafeDictionary	138.03 μs	4.081 μs	11.969 μs	138.10 μs	172.10 μs	110.40 μs	0.94	0.19	9.0000	4.0000	4 KB
AddOrUpdateAllNewKeysConcurrentDictionary	189.01 μs	10.126 μs	29.697 μs	184.00 μs	259.10 μs	109.00 μs	1.29	0.29	9.0000	19.0000	57 KB

Inline Async Method Parameters vs Async Method Parameters Evaluated Beforehand

Method	Mean	Error	StdDev	Max	Min	Ratio	RatioSD	Completed Work Items	Allocated
AsyncMethodParamsPassedInline	54.20 ms	1.083 ms	2.445 ms	58.76 ms	49.77 ms	1.00	0.00	2.0000	885 B
AsyncMethodParamsEvaluatedBeforehand	33.04 ms	0.648 ms	1.324 ms	36.25 ms	30.47 ms	0.61	0.04	2.0000	851 B

IList and ImmutableList - ForEach vs For Loop

Method	Mean	Error	StdDev	Max	Min	Ratio	RatioSD	Allocated
EnumerateIList	17.75 μs	0.481 μs	1.324 μs	22.50 μs	16.20 μs	1.00	0.00	480 B
EnumerateIListForEach	75.09 μs	1.956 μs	5.289 μs	91.50 μs	69.30 μs	4.26	0.44	520 B
EnumerateImmutable	525.73 μs	10.353 μs	9.685 μs	548.30 μs	513.00 μs	30.48	1.69	480 B
EnumerateImmutableForEach	250.62 μs	4.212 μs	6.558 μs	264.30 μs	241.30 μs	14.41	1.03	480 B

Parallel For vs For Loop with Task.Run and AwaitAll

Method	Mean	Error	StdDev	Max	Min	Completed Work Items	Allocated
ParallelForListOperation	54.53 μs	1.088 μs	2.867 μs	62.10 μs	49.60 μs	7.0000	4 KB
TaskRunListOperation	3,430.66 μs	184.293 μs	543.392 μs	4,650.40 μs	2,379.30 μs	10000.0000	1,820 KB

List vs Lazy<List>

Method	Mean	Error	StdDev	Median	Max	Min	Ratio	RatioSD	Gen 0	Allocated
UseListConditionally	292.2 ns	5.83 ns	15.96 ns	289.3 ns	329.5 ns	261.8 ns	1.00	0.00	0.2828	1,184 B
UseLazyListConditionally	177.4 ns	3.58 ns	8.43 ns	172.2 ns	200.2 ns	168.9 ns	0.61	0.05	0.1585	664 B
UseListUnconditionally	336.2 ns	6.28 ns	10.84 ns	336.7 ns	355.9 ns	306.1 ns	1.17	0.06	0.2828	1,184 B
UseLazyListUnconditionally	361.2 ns	8.40 ns	24.63 ns	367.6 ns	406.9 ns	307.2 ns	1.23	0.11	0.2999	1,256 B