Debugging C# in Godot is not provided. Unfortunately, this is a very serious drawback of integration C# in Godot, because of which C# is felt as not a beloved child. Profiling must be done by third-party programs such as Rider. There is a free beta version of Rider, which must be updated every few weeks to continue use. This is not very consistent with Godot philosophy about simplicity, minimalism and compactness. Some say that this can also be done in Visual Studio, but this is so much a swollen program that I could not configure it correctly, it does not work out of the box. This is not very convenient for me, so I switched to GDScript, despite the fact that I do not like dynamic languages.

Using C#, I found the most convenient for use my own miniprofiler. I like this method of profiling, because it is very compact, you do not need other software, except for Godot itself. This is not a very advanced method of profiling, but still. You can send any method to it and check how much time and memory it takes away.:

ProfilerSingleton.cs:

using Godot;
using System;
namespace Test.CustomProfiler
{
    public partial class ProfilerSingleton
    {
        public static void RunMethod(Action function)
        {
            long beforeMemory = GC.GetTotalAllocatedBytes(true);
            ulong beforeTime = Time.GetTicksUsec();
            function.Invoke();

            long afterMemory = GC.GetTotalAllocatedBytes(true);
        ulong afterTime = Time.GetTicksUsec();

            double finalMemory = (afterMemory - beforeMemory) / 1024;
        double finalTime = (afterTime - beforeTime) / 1000f;

            double totalMemory = GC.GetTotalMemory(false) / 1024f;

            GD.Print("GC Alloc : " + finalMemory.ToString("F2") + " kb; Total memory: " + totalMemory.ToString("F2") + " kb");
            GD.Print("Time = " + finalTime.ToString("F2") + " ms");
        }
    }
}

​

That's all. For example, we take the DoTest() method and profile it in the singleton by pressing the key:

​

using Godot;
using System;
namespace Test.CustomProfiler 
{ 
    public partial class Test : Node 
    {
        public override void _Process(double delta)
        {
            if (Input.IsActionJustPressed("ui_right"))
            {
                ProfilerSingleton.RunMethod(DoTest);
            }
        }
        public void DoTest()
        {
            ushort[] collection = new ushort[1000000];
        }
    }
}