Add Stopwatch

Scripts/Format/Editor/VRMExporterMenu.cs

@@ -99,6 +99,8 @@ namespace VRM
                 Undo.PerformUndo();
             }
 
+            var sw = System.Diagnostics.Stopwatch.StartNew();
+
             VRMExporter.Export(target, path, gltf => {
 
                 gltf.extensions.VRM.meta.title = Title;
@@ -106,6 +108,8 @@ namespace VRM
 
             });
 
+            Debug.LogFormat("Export elapsed {0}", sw.Elapsed);
+
             if (Target.gameObject!=target)
             {
                 GameObject.DestroyImmediate(target);