StringBuilder Append Benchmark for .NET 7 v .NET 8

StringBuilderDotnet7-v-DotNet8.cs

using System.Text;
using BenchmarkDotNet.Attributes;
using BenchmarkDotNet.Columns;
using BenchmarkDotNet.Configs;
using BenchmarkDotNet.Jobs;
using BenchmarkDotNet.Reports;

namespace BenchmarkDotNet.Samples
{
    [Config(typeof(Config))]
    [SimpleJob(RuntimeMoniker.Net80)]
    [SimpleJob(RuntimeMoniker.Net70, baseline: true)]
    [HideColumns(Column.RatioSD, Column.AllocRatio, Column.Error, Column.StdDev, Column.Runtime)]
    public class StringBuilderAppend
    {
        [Params(100)]
        public int Concats { get; set; }

        [Benchmark]
        public string SB_10()
        {
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < Concats; i++)
            {
                result.Append("1234567890");
            }

            return result.ToString();
        }

        [Benchmark]
        public string SB_100()
        {
            StringBuilder result = new StringBuilder();
            for (int i = 0; i < Concats; i++)
            {
                result.Append("khtFRrQOx0lsxNOSJuoyon2NE2csvMRkhZ9OqnrLQe63UIPlMu3Eyn2iWZh7UDfT8wrK5t2K8vOO2JUk4ymi9l0K4zNXD5KqkzVy");
            }

            return result.ToString();
        }

        private class Config : ManualConfig
        {
            public Config()
            {
                SummaryStyle =
                    SummaryStyle.Default.WithRatioStyle(RatioStyle.Percentage)
                    .WithTimeUnit(Perfolizer.Horology.TimeUnit.Millisecond);
            }
        }
    }
}