InterpolatedStrings.cs

using BenchmarkDotNet.Attributes;

namespace BenchmarkCore
{
    [MemoryDiagnoser]
    public class InterpolatedStrings
    {
        [Benchmark]
        public string IntToString()
        {
            return $"b{1.ToString()}b";
        }

        [Benchmark]
        public string Int()
        {
            return $"a{1}a";
        }
    }
}

results.md

      Method |      Mean |    Error |    StdDev |    Median |  Gen 0 | Allocated |
------------ |----------:|---------:|----------:|----------:|-------:|----------:|
 IntToString |  56.59 ns | 2.616 ns |  7.713 ns |  53.25 ns | 0.0111 |      64 B |
         Int | 147.84 ns | 5.335 ns | 15.730 ns | 144.41 ns | 0.0095 |      56 B |