diff -Nru horizon-18.3.5/debian/changelog horizon-18.3.5/debian/changelog
--- horizon-18.3.5/debian/changelog	2023-08-22 20:58:11.000000000 +0000
+++ horizon-18.3.5/debian/changelog	2024-03-21 13:54:12.000000000 +0000
@@ -1,3 +1,11 @@
+horizon (3:18.3.5-0ubuntu2.3) focal; urgency=medium
+
+  * d/p/lp2055409.patch: apply config
+    OPENSTACK_INSTANCE_RETRIEVE_IP_ADDRESSES to the
+    instance detail page (LP#2055409).
+
+ -- Rodrigo Barbieri <rodrigo.barbieri@canonical.com>  Fri, 21 Mar 2024 13:54:12 +0000
+
 horizon (3:18.3.5-0ubuntu2.2) focal; urgency=medium
 
   * d/p/get-ports-directly.patch: Get ports directly instead of via
diff -Nru horizon-18.3.5/debian/patches/lp2055409.patch horizon-18.3.5/debian/patches/lp2055409.patch
--- horizon-18.3.5/debian/patches/lp2055409.patch	1970-01-01 00:00:00.000000000 +0000
+++ horizon-18.3.5/debian/patches/lp2055409.patch	2024-03-21 13:54:12.000000000 +0000
@@ -0,0 +1,94 @@
+From ef9308fc286433bc2f3cc9eec36c9e873af29ad4 Mon Sep 17 00:00:00 2001
+From: Rodrigo Barbieri <rodrigo.barbieri2010@gmail.com>
+Date: Fri, 26 Jan 2024 15:10:41 -0300
+Subject: [PATCH] Extend configurable skippability of neutron calls to project
+ instance detail
+
+The OPENSTACK_INSTANCE_RETRIEVE_IP_ADDRESSES config aids
+in envs struggling to load the instance list due to having
+too many ports or bad neutron plugin performance. However,
+the config does not apply its effect to the instance detail
+page, which cannot be loaded due to the neutron calls
+taking too long.
+
+This patch extends the config option to the instance
+detail page, allowing the same benefit (and side-effects)
+of the instance list page.
+
+Related-bug: #2045168
+Change-Id: I3e71a208a1c7212e168d63a259f2adddf27dbabf
+(cherry picked from commit 95089025fda7c8cce6f7195e2a63f7f09efc9e0a)
+(cherry picked from commit 4de36bb649c514f50d2a958c9277097a08b23cec)
+(cherry picked from commit e621c9d745a5a84201d1a625cd252356385059b4)
+(cherry picked from commit 8e624332831ec0a2638f917327abf971a407cf64)
+(cherry picked from commit 04cc79c9914bc137f413a47f8abfed856cebe21a)
+(cherry picked from commit 5ecdf818b4e5d6fa425736341e77af46816df5fb)
+(cherry picked from commit e0e0e576d5933b14ebe24b18555fa8cd4f8d8aee)
+(cherry picked from commit 2d1a215f882e5d68f16ee62e0cdbfeb0ba07aa40)
+---
+ .../dashboards/project/instances/tests.py     | 24 ++++++++++++++++---
+ .../dashboards/project/instances/views.py     |  2 ++
+ 2 files changed, 23 insertions(+), 3 deletions(-)
+
+Index: horizon-18.3.5/openstack_dashboard/dashboards/project/instances/tests.py
+===================================================================
+--- horizon-18.3.5.orig/openstack_dashboard/dashboards/project/instances/tests.py
++++ horizon-18.3.5/openstack_dashboard/dashboards/project/instances/tests.py
+@@ -1434,7 +1434,8 @@ class InstanceDetailTests(InstanceTestBa
+     def _get_instance_details(self, server, qs=None,
+                               flavor_return=None, volumes_return=None,
+                               security_groups_return=None,
+-                              flavor_exception=False):
++                              flavor_exception=False,
++                              skip_servers_update_addresses=False):
+ 
+         url = reverse('horizon:project:instances:detail', args=[server.id])
+         if qs:
+@@ -1467,8 +1468,11 @@ class InstanceDetailTests(InstanceTestBa
+ 
+         self.mock_server_get.assert_called_once_with(
+             helpers.IsHttpRequest(), server.id)
+-        self.mock_servers_update_addresses.assert_called_once_with(
+-            helpers.IsHttpRequest(), mock.ANY)
++        if skip_servers_update_addresses:
++            self.mock_servers_update_addresses.assert_not_called()
++        else:
++            self.mock_servers_update_addresses.assert_called_once_with(
++                helpers.IsHttpRequest(), mock.ANY)
+         self.mock_instance_volumes_list.assert_called_once_with(
+             helpers.IsHttpRequest(), server.id)
+         self.mock_flavor_get.assert_called_once_with(
+@@ -1504,6 +1508,20 @@ class InstanceDetailTests(InstanceTestBa
+         self.mock_is_extension_supported.assert_called_once_with(
+             helpers.IsHttpRequest(), 'mac-learning')
+ 
++    @override_settings(OPENSTACK_INSTANCE_RETRIEVE_IP_ADDRESSES=False)
++    @helpers.create_mocks({api.neutron: ['is_extension_supported']})
++    def test_instance_details_skip_servers_update_addresses(self):
++        server = self.servers.first()
++
++        self.mock_is_extension_supported.return_value = False
++
++        self._get_instance_details(
++            server,
++            skip_servers_update_addresses=True)
++
++        self.mock_is_extension_supported.assert_called_once_with(
++            helpers.IsHttpRequest(), 'mac-learning')
++
+     @helpers.create_mocks({api.neutron: ['is_extension_supported']})
+     def test_instance_details_volume_sorting(self):
+         server = self.servers.first()
+Index: horizon-18.3.5/openstack_dashboard/dashboards/project/instances/views.py
+===================================================================
+--- horizon-18.3.5.orig/openstack_dashboard/dashboards/project/instances/views.py
++++ horizon-18.3.5/openstack_dashboard/dashboards/project/instances/views.py
+@@ -540,6 +540,8 @@ class DetailView(tabs.TabView):
+             exceptions.handle(self.request, msg, ignore=True)
+ 
+     def _update_addresses(self, instance):
++        if not settings.OPENSTACK_INSTANCE_RETRIEVE_IP_ADDRESSES:
++            return
+         instance_id = instance.id
+         try:
+             api.network.servers_update_addresses(self.request, [instance])
diff -Nru horizon-18.3.5/debian/patches/series horizon-18.3.5/debian/patches/series
--- horizon-18.3.5/debian/patches/series	2023-08-22 20:58:11.000000000 +0000
+++ horizon-18.3.5/debian/patches/series	2024-03-21 13:54:12.000000000 +0000
@@ -6,3 +6,4 @@
 0001-Fix-for-Resize-instance-button.patch
 lp1827120.patch
 get-ports-directly.patch
+lp2055409.patch