release/scripts/modules/bpy/utils/__init__.py

@@ -1002,11 +1002,11 @@ def unregister_tool(tool_cls):
 
 # we start with the built-in default mapping
 def _blender_default_map():
-    import rna_manual_reference as ref_mod
-    ret = (ref_mod.url_manual_prefix, ref_mod.url_manual_mapping)
-    # avoid storing in memory
-    del _sys.modules["rna_manual_reference"]
-    return ret
+    # NOTE(@ideasman42): Avoid importing this as there is no need to keep the lookup table in memory.
+    # As this runs when the user accesses the "Online Manual", the overhead loading the file is acceptable.
+    # In my tests it's under 1/100th of a second loading from a `pyc`.
+    ref_mod = execfile(_os.path.join(_script_base_dir, "modules", "rna_manual_reference.py"))
+    return (ref_mod.url_manual_prefix, ref_mod.url_manual_mapping)
 
 
 # hooks for doc lookups