CompilationTimeTracker.cs

using System.Collections.Generic;
using System.Diagnostics;
using UnityEditor;
using UnityEditor.Compilation;
using Debug = UnityEngine.Debug;

[InitializeOnLoad]
internal static class CompilationTimeTracker
{
    private static readonly Dictionary<string, Stopwatch> Dictionary;

#if UNITY_EDITOR
    static CompilationTimeTracker()
    {
        if (!EditorApplication.isPlayingOrWillChangePlaymode)
        {
            if (!EditorPrefs.GetBool(PlayerPrefsName, false)) return;

            CompilationPipeline.assemblyCompilationStarted += OnAssemblyCompilationStarted;
            CompilationPipeline.assemblyCompilationFinished += OnAssemblyCompilationFinished;
            Dictionary = new Dictionary<string, Stopwatch>();
        }
    }
#endif

    private static void OnAssemblyCompilationStarted(string value)
    {
        if (!EditorPrefs.GetBool(PlayerPrefsName, false)) return;

        if (Dictionary.ContainsKey(value))
            Dictionary[value] = Stopwatch.StartNew();
        else
            Dictionary.Add(value, Stopwatch.StartNew());
    }

    private static void OnAssemblyCompilationFinished(string value, CompilerMessage[] messages)
    {
        if (!EditorPrefs.GetBool(PlayerPrefsName, false)) return;

        Dictionary[value].Stop();
        Debug.Log(/*Assembly */$"{value.Replace("Library/ScriptAssemblies/", "")} built in {Dictionary[value].Elapsed.TotalSeconds:F} seconds.");
    }


    const string MenuName = "Window/CompilationTimeTracker";
    const string PlayerPrefsName = "EditorCompilationTimeTracker";
    public static bool IsEnabled
    {
        get => EditorPrefs.GetBool(PlayerPrefsName, true);
        set => EditorPrefs.SetBool(PlayerPrefsName, value);
    }
    [MenuItem(MenuName/*, priority = 999999*/)]
    private static void ToggleAction()
    {
        IsEnabled = !IsEnabled;
        if (Dictionary != null) Dictionary.Clear();
    }
    [MenuItem(MenuName, true/*, priority = 999999*/)]
    private static bool ToggleActionValidate()
    {
        Menu.SetChecked(MenuName, IsEnabled);
        return true;
    }
}