Find out what assemblies are being built and how long each takes.

using System; using System.Collections.Generic; using System.Text; using UnityEditor; using UnityEditor.Compilation; using UnityEngine;

[InitializeOnLoad] public class AsmdefDebug { const string AssemblyReloadEventsEditorPref = "AssemblyReloadEventsTime"; const string AssemblyCompilationEventsEditorPref = "AssemblyCompilationEvents"; static readonly int ScriptAssembliesPathLen = "Library/ScriptAssemblies/".Length;

static Dictionary<string, DateTime> s_StartTimes = new Dictionary<string, DateTime>();

static StringBuilder s_BuildEvents = new StringBuilder();
static double s_CompilationTotalTime;

static AsmdefDebug()
{
    CompilationPipeline.assemblyCompilationStarted += CompilationPipelineOnAssemblyCompilationStarted;
    CompilationPipeline.assemblyCompilationFinished += CompilationPipelineOnAssemblyCompilationFinished;
    AssemblyReloadEvents.beforeAssemblyReload += AssemblyReloadEventsOnBeforeAssemblyReload;
    AssemblyReloadEvents.afterAssemblyReload += AssemblyReloadEventsOnAfterAssemblyReload;
}

static void CompilationPipelineOnAssemblyCompilationStarted(string assembly)
{
    s_StartTimes[assembly] = DateTime.UtcNow;
}

static void CompilationPipelineOnAssemblyCompilationFinished(string assembly, CompilerMessage[] arg2)
{
    var time = s_StartTimes[assembly];
    var timeSpan = DateTime.UtcNow - s_StartTimes[assembly];
    s_CompilationTotalTime += timeSpan.TotalMilliseconds;
    s_BuildEvents.AppendFormat("{0:0.00}s {1}\n", timeSpan.TotalMilliseconds / 1000f, assembly.Substring(ScriptAssembliesPathLen, assembly.Length - ScriptAssembliesPathLen));
}

static void AssemblyReloadEventsOnBeforeAssemblyReload()
{
    s_BuildEvents.AppendFormat("compilation total: {0:0.00}s\n", s_CompilationTotalTime / 1000f);
    EditorPrefs.SetString(AssemblyReloadEventsEditorPref, DateTime.UtcNow.ToBinary().ToString());
    EditorPrefs.SetString(AssemblyCompilationEventsEditorPref, s_BuildEvents.ToString());
}

static void AssemblyReloadEventsOnAfterAssemblyReload()
{
    var binString = EditorPrefs.GetString(AssemblyReloadEventsEditorPref);

    long bin = 0;
    if (long.TryParse(binString, out bin))
    {
        var date = DateTime.FromBinary(bin);
        var time = DateTime.UtcNow - date;
        var compilationTimes = EditorPrefs.GetString(AssemblyCompilationEventsEditorPref);
        if (!string.IsNullOrEmpty(compilationTimes))
        {
            Debug.Log("Compilation Report\n" + compilationTimes + "Assembly Reload Time: " + time.TotalSeconds + "s\n");
        }
    }
}

}