BenchmarkStringComparison.cs

// Copyright (c) ppy Pty Ltd <contact@ppy.sh>. Licensed under the MIT Licence.
// See the LICENCE file in the repository root for full licence text.

using System;
using BenchmarkDotNet.Attributes;

namespace osu.Game.Benchmarks
{
    public class BenchmarkStringComparison
    {
        private string[] strings = null!;

        [Params(StringComparison.Ordinal, StringComparison.OrdinalIgnoreCase, StringComparison.InvariantCulture)]
        public StringComparison ComparisonMode { get; set; }

        [GlobalSetup]
        public void GlobalSetUp()
        {
            strings = new string[10000];

            for (int i = 0; i < strings.Length; ++i)
                strings[i] = Guid.NewGuid().ToString();

            for (int i = 0; i < strings.Length; ++i)
            {
                if (i % 2 == 0)
                    strings[i] = strings[i].ToUpperInvariant();
            }
        }

        [Benchmark]
        public void TestSorting()
        {
            for (int i = 0; i < strings.Length; ++i)
            {
                for (int j = i + 1; j < strings.Length; ++j)
                    _ = string.Compare(strings[i], strings[j], ComparisonMode);
            }
        }
    }
}

result.md

Method	ComparisonMode	Mean	Error	StdDev
TestSorting	InvariantCulture	954.5 ms	18.25 ms	17.07 ms
TestSorting	Ordinal	110.8 ms	1.27 ms	1.19 ms
TestSorting	OrdinalIgnoreCase	187.6 ms	3.32 ms	3.10 ms