Delayed initialization (accelerate startup)

InitGui.py

@@ -24,26 +24,29 @@
 import FreeCAD as App
 import FreeCADGui as Gui
 
+# Caveat: do not import Render here (too early, will slow down global startup)
+
 
 class RenderWorkbench(Gui.Workbench):
     """The Render Workbench."""
 
     def __init__(self):
         """Initialize object."""
-        # pylint: disable=import-outside-toplevel
-        from Render.constants import TRANSDIR
+        # Caveat: do not import Render here
+        # (too early, will slow down global startup)
 
-        from FreeCADGui import addLanguagePath, updateLocale
+        # pylint: disable=import-outside-toplevel
+        import FreeCAD
 
-        translate = App.Qt.translate
-        addLanguagePath(TRANSDIR)
-        updateLocale()
+        try:
+            translate = FreeCAD.Qt.translate
+        except AttributeError:
+            translate = lambda _, x: x
 
         self.__class__.MenuText = "Render"
         self.__class__.ToolTip = translate(
             "Workbench",
-            "The Render workbench is a "
-            "modern replacement for "
+            "The Render workbench is a modern replacement for "
             "the Raytracing workbench",
         )
         self.__class__.Icon = """
@@ -111,9 +114,20 @@ def Initialize(self):
         from PySide.QtCore import QT_TRANSLATE_NOOP
         from Render.utils import translate
         from FreeCAD import Console
-        from FreeCADGui import addIconPath, addPreferencePage
-        from Render import RENDER_COMMANDS, ICONDIR, PreferencesPage
+        from FreeCADGui import (
+            addIconPath,
+            addPreferencePage,
+            addLanguagePath,
+            updateLocale,
+        )
+
+        from Render import RENDER_COMMANDS, ICONDIR, TRANSDIR, PreferencesPage
+
+        # Translations
+        addLanguagePath(TRANSDIR)
+        updateLocale()
 
+        # GUI
         self.appendToolbar(
             QT_TRANSLATE_NOOP("Workbench", "Render"), RENDER_COMMANDS
         )