diff --git a/jedi/api/environment.py b/jedi/api/environment.py
index 22c7c4d6..40d5e626 100644
--- a/jedi/api/environment.py
+++ b/jedi/api/environment.py
@@ -14,7 +14,7 @@ from collections import namedtuple
 from distutils.spawn import find_executable
 
 from jedi._compatibility import GeneralizedPopen
-from jedi.cache import memoize_method
+from jedi.cache import memoize_method, time_cache
 from jedi.evaluate.compiled.subprocess import get_subprocess, \
     EvaluatorSameProcess, EvaluatorSubprocess
 
@@ -170,6 +170,11 @@ def get_default_environment():
     return SameEnvironment()
 
 
+@time_cache("_default_environment_validity")
+def get_cached_default_environment():
+    return get_default_environment()
+
+
 def find_virtualenvs(paths=None, **kwargs):
     """
     :param paths: A list of paths in your file system to be scanned for
diff --git a/jedi/api/project.py b/jedi/api/project.py
index ec01f82f..ca6992b5 100644
--- a/jedi/api/project.py
+++ b/jedi/api/project.py
@@ -3,7 +3,7 @@ import json
 
 from jedi._compatibility import FileNotFoundError, NotADirectoryError
 from jedi.api.environment import SameEnvironment, \
-    get_default_environment
+    get_cached_default_environment
 from jedi.api.exceptions import WrongVersion
 from jedi._compatibility import force_unicode
 from jedi.evaluate.sys_path import discover_buildout_paths
@@ -136,7 +136,7 @@ class Project(object):
 
     def get_environment(self):
         if self._environment is None:
-            return get_default_environment()
+            return get_cached_default_environment()
 
         return self._environment
 
diff --git a/jedi/settings.py b/jedi/settings.py
index f1ae6dbb..bbd3a378 100644
--- a/jedi/settings.py
+++ b/jedi/settings.py
@@ -161,3 +161,5 @@ call_signatures_validity = 3.0
 Finding function calls might be slow (0.1-0.5s). This is not acceptible for
 normal writing. Therefore cache it for a short time.
 """
+
+_default_environment_validity = 10 * 60  # 0 Minutes