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new SourcePropertySymbol() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourcePropertySymbol.Create() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.AddNonTypeMembers() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.AddDeclaredNontypeMembers() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.BuildMembersAndInitializers() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.GetMembersAndInitializers() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.MakeAllMembers() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.CodeAnalysis.CSharp.dll [246]
SourceMemberContainerTypeSymbol.GetMembersByNameSlow() in Microsoft.CodeAnalysis.CSharp.Symbols, Microsoft.Cod

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BenchmarkDotNet=v0.11.3, OS=Windows 10.0.18362

Intel Core i7-6700 CPU 3.40GHz (Skylake), 1 CPU, 8 logical and 4 physical cores

.NET Core SDK=3.0.100-preview9-014004

[Host] : .NET Core 3.0.0-preview9-19423-09 (CoreCLR 4.700.19.42102, CoreFX 4.700.19.42104), 64bit RyuJIT

RyuJitX64 : .NET Core 3.0.0-preview9-19423-09 (CoreCLR 4.700.19.42102, CoreFX 4.700.19.42104), 64bit RyuJIT

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using System;
using System.Collections.Generic;
using NUnit.Framework;

namespace LikeExcel {
    class Program {
        static void Main() {
        }
    }

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                    Method |          Job |       Jit | Platform | ItemsCount |            Mean |           Error |          StdDev |          Median | Ratio | RatioSD |
-------------------------- |------------- |---------- |--------- |----------- |----------------:|----------------:|----------------:|----------------:|------:|--------:|
       ForEachArrayAsArray | LegacyJitX64 | LegacyJit |      X64 |         10 |        73.61 ns |      16.4262 ns |      48.4331 ns |       105.16 ns |     ? |       ? |
 ForEachArrayAsIEnumerable | LegacyJitX64 | LegacyJit |      X64 |         10 |       960.62 ns |      56.1115 ns |     151.7007 ns |     1,066.67 ns |     ? |       ? |
         ForEachListAsList | LegacyJitX64 | LegacyJit |      X64 |         10 |       168.26 ns |      49.1610 ns |     144.9522 ns |        60.09 ns |     ? |       ? |
  ForEachListAsIEnumerable | LegacyJitX64 | LegacyJit |      X64 |         10 |     1,028.29 ns |      65.2682 ns |     174.2140 ns |     1,006.57 ns |     ? |       ? |
    

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using System.Collections.Generic;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Running;

namespace ConsoleApp2 {
    [LegacyJitX64Job, LegacyJitX86Job, RyuJitX64Job]
    public class Benchmark {
        [Params(10, 100, 1000, 10000, 100000, 1000000)]
        public int ItemsCount { get; set; }

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using System;
using System.Drawing;
using System.Reflection;
using System.Runtime.InteropServices;

namespace ConsoleApplication95 {
    class Program {
        [StructLayout(LayoutKind.Explicit)]
        class BrushManager {