Benchmarks

Benchmarks have been implemented with BenchmarkDotNet.

Configuration

BenchmarkDotNet=v0.11.5
OS=Windows 10.0.18362
Processor=Intel Core i7-7700K CPU 4.20GHz (Kaby Lake), 1 CPU, 8 logical and 4 physical cores
  [Host]     : .NET Framework 4.7.2 (CLR 4.0.30319.42000), 64bit RyuJIT-v4.8.3815.0
  DefaultJob : .NET Framework 4.7.2 (CLR 4.0.30319.42000), 64bit RyuJIT-v4.8.3815.0

Results

Single constructor call

Method	Mean	Error	StdDev	Ratio	RatioSD
Direct_CopyConstructor	2.953 ns	0.1308 ns	0.2488 ns	1.00	0.00
Activator_CopyConstructor	566.443 ns	11.2951 ns	13.0075 ns	185.85	19.21
Expression_CopyConstructor	7.727 ns	0.2140 ns	0.2548 ns	2.54	0.21
ImmediateType_CopyConstructor	6.313 ns	0.1977 ns	0.4774 ns	2.18	0.27

Multiple constructor calls

Method	Mean	Error	StdDev	Ratio	RatioSD
Direct_CopyConstructor	8.716 ns	0.1260 ns	0.1178 ns	1.00	0.00
Activator_CopyConstructor	2,255.524 ns	18.1062 ns	16.9366 ns	258.83	4.22
Expression_CopyConstructor	30.300 ns	0.1712 ns	0.1602 ns	3.48	0.05
ImmediateType_CopyConstructor	23.860 ns	0.4966 ns	0.4147 ns	2.74	0.05

---

Results demonstrate that ImmediateReflection is really faster than using the classic Activator.CreateInstance() to do copy constructions.