diff --git a/tests/test_async.py b/tests/test_async.py
index b379baea..e7fc1a95 100755
--- a/tests/test_async.py
+++ b/tests/test_async.py
@@ -97,6 +97,7 @@ class AsyncTests(ConnectingTestCase):
         self.assertFalse(self.conn.isexecuting())
         self.assertEquals(cur.fetchone()[0], "a")
 
+    @slow
     @skip_before_postgres(8, 2)
     def test_async_callproc(self):
         cur = self.conn.cursor()
@@ -107,6 +108,7 @@ class AsyncTests(ConnectingTestCase):
         self.assertFalse(self.conn.isexecuting())
         self.assertEquals(cur.fetchall()[0][0], '')
 
+    @slow
     def test_async_after_async(self):
         cur = self.conn.cursor()
         cur2 = self.conn.cursor()
diff --git a/tests/test_connection.py b/tests/test_connection.py
index a5b5c418..1ea00da3 100755
--- a/tests/test_connection.py
+++ b/tests/test_connection.py
@@ -125,6 +125,7 @@ class ConnectionTests(ConnectingTestCase):
         self.assert_('table3' in conn.notices[2])
         self.assert_('table4' in conn.notices[3])
 
+    @slow
     def test_notices_limited(self):
         conn = self.conn
         cur = conn.cursor()
@@ -138,6 +139,7 @@ class ConnectionTests(ConnectingTestCase):
         self.assertEqual(50, len(conn.notices))
         self.assert_('table99' in conn.notices[-1], conn.notices[-1])
 
+    @slow
     def test_notices_deque(self):
         from collections import deque
 
diff --git a/tests/test_copy.py b/tests/test_copy.py
index 8cbe4eaa..3aa509b5 100755
--- a/tests/test_copy.py
+++ b/tests/test_copy.py
@@ -312,6 +312,7 @@ class CopyTests(ConnectingTestCase):
             curs.copy_from, StringIO('aaa\nbbb\nccc\n'), 'tcopy')
         self.assertEqual(curs.rowcount, -1)
 
+    @slow
     def test_copy_from_segfault(self):
         # issue #219
         script = ("""\
@@ -330,6 +331,7 @@ conn.close()
         proc.communicate()
         self.assertEqual(0, proc.returncode)
 
+    @slow
     def test_copy_to_segfault(self):
         # issue #219
         script = ("""\
diff --git a/tests/test_lobject.py b/tests/test_lobject.py
index 4da20e95..3379ec0c 100755
--- a/tests/test_lobject.py
+++ b/tests/test_lobject.py
@@ -29,8 +29,8 @@ from functools import wraps
 
 import psycopg2
 import psycopg2.extensions
-from testutils import unittest, decorate_all_tests, skip_if_tpc_disabled
-from testutils import ConnectingTestCase, skip_if_green
+from testutils import (unittest, decorate_all_tests, skip_if_tpc_disabled,
+    ConnectingTestCase, skip_if_green, slow)
 
 
 def skip_if_no_lo(f):
@@ -191,6 +191,7 @@ class LargeObjectTests(LargeObjectTestCase):
         self.assertEqual(x, u"some")
         self.assertEqual(lo.read(), u" data " + snowman)
 
+    @slow
     def test_read_large(self):
         lo = self.conn.lobject()
         data = "data" * 1000000
diff --git a/tests/test_module.py b/tests/test_module.py
index 6a1606d6..b166bac6 100755
--- a/tests/test_module.py
+++ b/tests/test_module.py
@@ -26,8 +26,8 @@ import os
 import sys
 from subprocess import Popen
 
-from testutils import unittest, skip_before_python, skip_before_postgres
-from testutils import ConnectingTestCase, skip_copy_if_green, script_to_py3
+from testutils import (unittest, skip_before_python, skip_before_postgres,
+    ConnectingTestCase, skip_copy_if_green, script_to_py3, slow)
 
 import psycopg2
 
@@ -311,6 +311,7 @@ class ExceptionsTestCase(ConnectingTestCase):
 
 
 class TestExtensionModule(unittest.TestCase):
+    @slow
     def test_import_internal(self):
         # check that the internal package can be imported "naked"
         # we may break this property if there is a compelling reason to do so,
diff --git a/tests/test_notify.py b/tests/test_notify.py
index 4e99a3e9..0e74e1d5 100755
--- a/tests/test_notify.py
+++ b/tests/test_notify.py
@@ -111,6 +111,7 @@ conn.close()
             self.assertEqual(pids[name], pid)
             names.pop(name)     # raise if name found twice
 
+    @slow
     def test_notifies_received_on_execute(self):
         self.autocommit(self.conn)
         self.listen('foo')