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_Constructor	3.775 ns	0.1453 ns	0.1784 ns	1.00	0.00
Activator_Constructor	40.120 ns	0.9452 ns	1.9308 ns	10.83	0.73
Expression_Constructor	9.413 ns	0.1010 ns	0.0843 ns	2.50	0.12
FastMember_Constructor	5.523 ns	0.1383 ns	0.1294 ns	1.47	0.07
ImmediateType_Constructor	6.081 ns	0.1902 ns	5.938 ns	1.62	0.12

Multiple constructor calls

Method	Mean	Error	StdDev	Ratio	RatioSD
Direct_Constructor	10.06 ns	0.0308 ns	0.0273 ns	1.00	0.00
Activator_Constructor	188.84 ns	1.7316 ns	1.5350 ns	18.77	0.15
Expression_Constructor	35.45 ns	0.4622 ns	0.4098 ns	3.52	0.04
FastMember_Constructor	23.54 ns	0.4225 ns	0.3746 ns	2.34	0.04
ImmediateType_Constructor	23.35 ns	0.3559 ns	0.2778 ns	2.32**	0.03

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Results demonstrate that ImmediateReflection is really faster than using the classic Activator.CreateInstance(). Note that compared to FastMember the slight difference is explained by the fact that ImmediateReflection tries to keep as much as possible an API like the standard one involving further checks not done in FastMember.