diff --git a/jedi/api/interpreter.py b/jedi/api/interpreter.py
index fa6cf103..7c0d47c4 100644
--- a/jedi/api/interpreter.py
+++ b/jedi/api/interpreter.py
@@ -80,6 +80,9 @@ class LazyName(helpers.FakeName):
                               mod)
 
         module = compiled.CompiledObject(raw_module)
+        if raw_module == builtins:
+            # The builtins module is special and always cached.
+            module = compiled.builtin
         return compiled.create(self._evaluator, self._value, module, module)
 
     @parent.setter
diff --git a/jedi/evaluate/compiled/__init__.py b/jedi/evaluate/compiled/__init__.py
index 1c95076b..8db4db07 100644
--- a/jedi/evaluate/compiled/__init__.py
+++ b/jedi/evaluate/compiled/__init__.py
@@ -82,6 +82,7 @@ class CompiledObject(Base):
             return CompiledObject(c, self.parent)
         return self
 
+    @underscore_memoization
     def get_defined_names(self):
         names = []
         cls = self._cls()
diff --git a/jedi/evaluate/iterable.py b/jedi/evaluate/iterable.py
index e38e2a33..75a03b9b 100644
--- a/jedi/evaluate/iterable.py
+++ b/jedi/evaluate/iterable.py
@@ -86,7 +86,6 @@ class GeneratorMethod(object):
         return self._generator.iter_content()
 
     def __getattr__(self, name):
-        print(self, name)
         return getattr(self._builtin_func, name)