Throw helper performance

ExceptionBenchmark-report-github.md

BenchmarkDotNet=v0.13.5, OS=Windows 11 (10.0.22621.1555/22H2/2022Update/SunValley2)
12th Gen Intel Core i9-12900H, 1 CPU, 20 logical and 14 physical cores
.NET SDK=7.0.203
  [Host]     : .NET 6.0.16 (6.0.1623.17311), X64 RyuJIT AVX2
  DefaultJob : .NET 6.0.16 (6.0.1623.17311), X64 RyuJIT AVX2

Method	Mean	Error	StdDev
Case_A	2.423 ns	0.0553 ns	0.0490 ns
Case_B	1.727 ns	0.0480 ns	0.0449 ns

ExceptionBenchmark.cs

using System.Runtime.CompilerServices;
using BenchmarkDotNet.Attributes;

namespace Benchmarks;

public class ExceptionBenchmark
{
    [Benchmark]
    public A Case_A()
    {
        return new A("first", "last");
    }

    [Benchmark]
    public B Case_B()
    {
        return new B("first", "last");
    }

    public class A
    {
        public A(string firstName, string lastName)
        {
            if (firstName is null)
            {
                throw new ArgumentNullException(nameof(firstName));
            }

            if (lastName is null)
            {
                throw new ArgumentNullException(nameof(lastName));
            }
        }
    }

    public class B
    {
        public B(string firstName, string lastName)
        {
            if (firstName is null)
            {
                ThrowArgumentNullException(nameof(firstName));
            }

            if (lastName is null)
            {
                ThrowArgumentNullException(nameof(lastName));
            }
        }

        [MethodImpl(MethodImplOptions.NoInlining)]
        private static void ThrowArgumentNullException(string paramName)
        {
            throw new ArgumentNullException(paramName);
        }
    }
}