diff --git a/tempest/scenario/test_aggregates_basic_ops.py b/tempest/scenario/test_aggregates_basic_ops.py
index 5152472..b0b516a 100644
--- a/tempest/scenario/test_aggregates_basic_ops.py
+++ b/tempest/scenario/test_aggregates_basic_ops.py
@@ -96,6 +96,7 @@
         return aggregate
 
     @decorators.idempotent_id('cb2b4c4f-0c7c-4164-bdde-6285b302a081')
+    @test.attr(type='slow')
     @test.services('compute')
     def test_aggregate_basic_ops(self):
         self.useFixture(fixtures.LockFixture('availability_zone'))
diff --git a/tempest/scenario/test_encrypted_cinder_volumes.py b/tempest/scenario/test_encrypted_cinder_volumes.py
index da29485..a05b1b1 100644
--- a/tempest/scenario/test_encrypted_cinder_volumes.py
+++ b/tempest/scenario/test_encrypted_cinder_volumes.py
@@ -62,6 +62,7 @@
         self.nova_volume_detach(server, attached_volume)
 
     @decorators.idempotent_id('79165fb4-5534-4b9d-8429-97ccffb8f86e')
+    @test.attr(type='slow')
     @test.services('compute', 'volume', 'image')
     def test_encrypted_cinder_volumes_luks(self):
         server = self.launch_instance()
@@ -71,6 +72,7 @@
         self.attach_detach_volume(server, volume)
 
     @decorators.idempotent_id('cbc752ed-b716-4717-910f-956cce965722')
+    @test.attr(type='slow')
     @test.services('compute', 'volume', 'image')
     def test_encrypted_cinder_volumes_cryptsetup(self):
         server = self.launch_instance()
diff --git a/tempest/scenario/test_network_advanced_server_ops.py b/tempest/scenario/test_network_advanced_server_ops.py
index 1196659..6665fa7 100644
--- a/tempest/scenario/test_network_advanced_server_ops.py
+++ b/tempest/scenario/test_network_advanced_server_ops.py
@@ -104,6 +104,7 @@
         return body['OS-EXT-SRV-ATTR:host']
 
     @decorators.idempotent_id('61f1aa9a-1573-410e-9054-afa557cab021')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_stop_start(self):
         keypair = self.create_keypair()
@@ -129,6 +130,7 @@
             server, keypair, floating_ip)
 
     @decorators.idempotent_id('88a529c2-1daa-4c85-9aec-d541ba3eb699')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_rebuild(self):
         keypair = self.create_keypair()
@@ -143,6 +145,7 @@
     @decorators.idempotent_id('2b2642db-6568-4b35-b812-eceed3fa20ce')
     @testtools.skipUnless(CONF.compute_feature_enabled.pause,
                           'Pause is not available.')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_pause_unpause(self):
         keypair = self.create_keypair()
@@ -160,6 +163,7 @@
     @decorators.idempotent_id('5cdf9499-541d-4923-804e-b9a60620a7f0')
     @testtools.skipUnless(CONF.compute_feature_enabled.suspend,
                           'Suspend is not available.')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_suspend_resume(self):
         keypair = self.create_keypair()
@@ -177,6 +181,7 @@
     @decorators.idempotent_id('719eb59d-2f42-4b66-b8b1-bb1254473967')
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize is not available.')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_resize(self):
         resize_flavor = CONF.compute.flavor_ref_alt
@@ -200,6 +205,7 @@
     @testtools.skipUnless(CONF.compute.min_compute_nodes > 1,
                           'Less than 2 compute nodes, skipping multinode '
                           'tests.')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_cold_migration(self):
         keypair = self.create_keypair()
@@ -225,6 +231,7 @@
     @testtools.skipUnless(CONF.compute.min_compute_nodes > 1,
                           'Less than 2 compute nodes, skipping multinode '
                           'tests.')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_server_connectivity_cold_migration_revert(self):
         keypair = self.create_keypair()
diff --git a/tempest/scenario/test_network_basic_ops.py b/tempest/scenario/test_network_basic_ops.py
index 51b59c9..e6a2e9d 100644
--- a/tempest/scenario/test_network_basic_ops.py
+++ b/tempest/scenario/test_network_basic_ops.py
@@ -406,6 +406,7 @@
     @decorators.idempotent_id('b158ea55-472e-4086-8fa9-c64ac0c6c1d0')
     @testtools.skipUnless(test.is_extension_enabled('net-mtu', 'network'),
                           'No way to calculate MTU for networks')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_mtu_sized_frames(self):
         """Validate that network MTU sized frames fit through."""
@@ -418,6 +419,7 @@
                       'Connectivity can only be tested when in a '
                       'multitenant network environment')
     @decorators.skip_because(bug="1610994")
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_connectivity_between_vms_on_different_networks(self):
         """Test connectivity between VMs on different networks
@@ -493,6 +495,7 @@
     @testtools.skipIf(CONF.network.shared_physical_network,
                       'Router state can be altered only with multitenant '
                       'networks capabilities')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_update_router_admin_state(self):
         """Test to update admin state up of router
@@ -526,6 +529,7 @@
                       'network isolation not available')
     @testtools.skipUnless(CONF.scenario.dhcp_client,
                           "DHCP client is not available.")
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_subnet_details(self):
         """Tests that subnet's extra configuration details are affecting VMs.
@@ -608,6 +612,7 @@
     @testtools.skipUnless(CONF.network_feature_enabled.port_admin_state_change,
                           "Changing a port's admin state is not supported "
                           "by the test environment")
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_update_instance_port_admin_state(self):
         """Test to update admin_state_up attribute of instance port
@@ -653,6 +658,7 @@
                                        should_succeed=True)
 
     @decorators.idempotent_id('759462e1-8535-46b0-ab3a-33aa45c55aaa')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_preserve_preexisting_port(self):
         """Test preserve pre-existing port
@@ -704,6 +710,7 @@
 
     @test.requires_ext(service='network', extension='l3_agent_scheduler')
     @decorators.idempotent_id('2e788c46-fb3f-4ac9-8f82-0561555bea73')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_router_rescheduling(self):
         """Tests that router can be removed from agent and add to a new agent.
@@ -783,6 +790,7 @@
     @testtools.skipUnless(CONF.compute_feature_enabled.interface_attach,
                           'NIC hotplug not available')
     @decorators.idempotent_id('7c0bb1a2-d053-49a4-98f9-ca1a1d849f63')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_port_security_macspoofing_port(self):
         """Tests port_security extension enforces mac spoofing
diff --git a/tempest/scenario/test_network_v6.py b/tempest/scenario/test_network_v6.py
index fcf395d..d8a1363 100644
--- a/tempest/scenario/test_network_v6.py
+++ b/tempest/scenario/test_network_v6.py
@@ -240,6 +240,7 @@
     def test_dualnet_dhcp6_stateless_from_os(self):
         self._prepare_and_test(address6_mode='dhcpv6-stateless', dualnet=True)
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('cf1c4425-766b-45b8-be35-e2959728eb00')
     @test.services('compute', 'network')
     def test_dualnet_multi_prefix_dhcpv6_stateless(self):
diff --git a/tempest/scenario/test_object_storage_basic_ops.py b/tempest/scenario/test_object_storage_basic_ops.py
index c989e01..7fd8c91 100644
--- a/tempest/scenario/test_object_storage_basic_ops.py
+++ b/tempest/scenario/test_object_storage_basic_ops.py
@@ -46,6 +46,7 @@
         self.delete_container(container_name)
 
     @decorators.idempotent_id('916c7111-cb1f-44b2-816d-8f760e4ea910')
+    @test.attr(type='slow')
     @test.services('object_storage')
     def test_swift_acl_anonymous_download(self):
         """This test will cover below steps:
diff --git a/tempest/scenario/test_security_groups_basic_ops.py b/tempest/scenario/test_security_groups_basic_ops.py
index 3d383f7..fa12f33 100644
--- a/tempest/scenario/test_security_groups_basic_ops.py
+++ b/tempest/scenario/test_security_groups_basic_ops.py
@@ -494,6 +494,7 @@
             raise
 
     @decorators.idempotent_id('f4d556d7-1526-42ad-bafb-6bebf48568f6')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_port_update_new_security_group(self):
         """Verifies the traffic after updating the vm port
@@ -548,6 +549,7 @@
             raise
 
     @decorators.idempotent_id('d2f77418-fcc4-439d-b935-72eca704e293')
+    @test.attr(type='slow')
     @test.services('compute', 'network')
     def test_multiple_security_groups(self):
         """Verify multiple security groups and checks that rules
@@ -579,6 +581,7 @@
                                    private_key=private_key,
                                    should_connect=True)
 
+    @test.attr(type='slow')
     @test.requires_ext(service='network', extension='port-security')
     @decorators.idempotent_id('7c811dcc-263b-49a3-92d2-1b4d8405f50c')
     @test.services('compute', 'network')
@@ -619,6 +622,7 @@
                 self._log_console_output(servers=tenant.servers)
             raise
 
+    @test.attr(type='slow')
     @test.requires_ext(service='network', extension='port-security')
     @decorators.idempotent_id('13ccf253-e5ad-424b-9c4a-97b88a026699')
     @testtools.skipUnless(
diff --git a/tempest/scenario/test_server_advanced_ops.py b/tempest/scenario/test_server_advanced_ops.py
index ec839cd..1960e9a 100644
--- a/tempest/scenario/test_server_advanced_ops.py
+++ b/tempest/scenario/test_server_advanced_ops.py
@@ -48,6 +48,7 @@
         cls.set_network_resources()
         super(TestServerAdvancedOps, cls).setup_credentials()
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('e6c28180-7454-4b59-b188-0257af08a63b')
     @testtools.skipUnless(CONF.compute_feature_enabled.resize,
                           'Resize is not available.')
@@ -69,6 +70,7 @@
         waiters.wait_for_server_status(self.servers_client, instance_id,
                                        'ACTIVE')
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('949da7d5-72c8-4808-8802-e3d70df98e2c')
     @testtools.skipUnless(CONF.compute_feature_enabled.suspend,
                           'Suspend is not available.')
diff --git a/tempest/scenario/test_shelve_instance.py b/tempest/scenario/test_shelve_instance.py
index 75cef88..9e763f8 100644
--- a/tempest/scenario/test_shelve_instance.py
+++ b/tempest/scenario/test_shelve_instance.py
@@ -74,6 +74,7 @@
                                         private_key=keypair['private_key'])
         self.assertEqual(timestamp, timestamp2)
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('1164e700-0af0-4a4c-8792-35909a88743c')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
@@ -81,6 +82,7 @@
     def test_shelve_instance(self):
         self._create_server_then_shelve_and_unshelve()
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('c1b6318c-b9da-490b-9c67-9339b627271f')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
diff --git a/tempest/scenario/test_snapshot_pattern.py b/tempest/scenario/test_snapshot_pattern.py
index 6dedd1d..a699de2 100644
--- a/tempest/scenario/test_snapshot_pattern.py
+++ b/tempest/scenario/test_snapshot_pattern.py
@@ -41,6 +41,7 @@
             raise cls.skipException("Snapshotting is not available.")
 
     @decorators.idempotent_id('608e604b-1d63-4a82-8e3e-91bc665c90b4')
+    @test.attr(type='slow')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     @test.services('compute', 'network', 'image')
diff --git a/tempest/scenario/test_stamp_pattern.py b/tempest/scenario/test_stamp_pattern.py
index 716c0bf..aabb767 100644
--- a/tempest/scenario/test_stamp_pattern.py
+++ b/tempest/scenario/test_stamp_pattern.py
@@ -88,6 +88,7 @@
                                           CONF.compute.build_interval):
             raise lib_exc.TimeoutException
 
+    @test.attr(type='slow')
     @decorators.skip_because(bug="1664793")
     @decorators.idempotent_id('10fd234a-515c-41e5-b092-8323060598c5')
     @testtools.skipUnless(CONF.compute_feature_enabled.snapshot,
diff --git a/tempest/scenario/test_volume_boot_pattern.py b/tempest/scenario/test_volume_boot_pattern.py
index b72dae9..8cab19c 100644
--- a/tempest/scenario/test_volume_boot_pattern.py
+++ b/tempest/scenario/test_volume_boot_pattern.py
@@ -95,7 +95,6 @@
         waiters.wait_for_server_termination(self.servers_client, server['id'])
 
     @decorators.idempotent_id('557cd2c2-4eb8-4dce-98be-f86765ff311b')
-    @test.attr(type='smoke')
     @testtools.skipUnless(CONF.network.public_network_id,
                           'The public_network_id option must be specified.')
     @test.services('compute', 'volume', 'image')
@@ -177,6 +176,7 @@
         self.assertEqual(timestamp, timestamp3)
 
     @decorators.idempotent_id('05795fb2-b2a7-4c9f-8fac-ff25aedb1489')
+    @test.attr(type='slow')
     @test.services('compute', 'image', 'volume')
     def test_create_server_from_volume_snapshot(self):
         # Create a volume from an image
diff --git a/tempest/scenario/test_volume_migrate_attached.py b/tempest/scenario/test_volume_migrate_attached.py
index 891e22d..f580ea6 100644
--- a/tempest/scenario/test_volume_migrate_attached.py
+++ b/tempest/scenario/test_volume_migrate_attached.py
@@ -91,6 +91,7 @@
         waiters.wait_for_volume_retype(self.volumes_client,
                                        volume_id, new_volume_type)
 
+    @test.attr(type='slow')
     @decorators.idempotent_id('deadd2c2-beef-4dce-98be-f86765ff311b')
     @test.services('compute', 'volume')
     def test_volume_migrate_attached(self):
diff --git a/tox.ini b/tox.ini
index d8d390e..ddda2ab 100644
--- a/tox.ini
+++ b/tox.ini
@@ -78,7 +78,8 @@
 # See the testrepository bug: https://bugs.launchpad.net/testrepository/+bug/1208610
 commands =
     find . -type f -name "*.pyc" -delete
-    tempest run --regex '(?!.*\[.*\bslow\b.*\])(^tempest\.(api|scenario))' {posargs}
+    tempest run --regex '(?!.*\[.*\bslow\b.*\])(^tempest\.api)' {posargs}
+    tempest run --combine --serial --regex '(?!.*\[.*\bslow\b.*\])(^tempest\.scenario)' {posargs}
 
 [testenv:full-serial]
 envdir = .tox/tempest