diff --git a/jedi/api/project.py b/jedi/api/project.py
index 772eb313..74b73db9 100644
--- a/jedi/api/project.py
+++ b/jedi/api/project.py
@@ -89,7 +89,19 @@ def _is_potential_project(path):
     return False
 
 
+_cached_default_project = None
+
+
 def get_default_project():
+    global _cached_default_project
+    if _cached_default_project is None:
+        # We are caching it here, because checking for it every time is just
+        # too much work.
+        _cached_default_project = _get_default_project()
+    return _cached_default_project
+
+
+def _get_default_project():
     previous = None
     curdir = dir = os.path.realpath(os.curdir())
     probable_path = None