diff --git a/CHANGELOG.txt b/CHANGELOG.txt
index 6e31af286..87033e081 100644
--- a/CHANGELOG.txt
+++ b/CHANGELOG.txt
@@ -25,6 +25,7 @@ Changelog
  * Added support for custom search handler classes to modeladmin's IndexView, and added a class that uses the default Wagtail search backend for searching (Seb Brown, Andy Babic)
  * Improved heading structure for screen reader users navigating the CMS admin (Beth Menzies, Helen Chapman)
  * Updated group edit view to expose the Permission object for each checkbox (George Hickman)
+ * Improve performance of Pages for Moderation panel (Fidel Ramos)
  * Fix: ModelAdmin no longer fails when filtering over a foreign key relation (Jason Dilworth, Matt Westcott)
  * Fix: The Wagtail version number is now visible within the Settings menu (Kevin Howbrook)
  * Fix: Scaling images now rounds values to an integer so that images render without errors (Adrian Brunyate)
diff --git a/CONTRIBUTORS.rst b/CONTRIBUTORS.rst
index badf7a942..a6fe94b24 100644
--- a/CONTRIBUTORS.rst
+++ b/CONTRIBUTORS.rst
@@ -378,6 +378,7 @@ Contributors
 * George Hickman
 * Eric Dyken
 * Jordan Bauer
+* Fidel Ramos
 
 Translators
 ===========
diff --git a/docs/releases/2.6.rst b/docs/releases/2.6.rst
index 3033483b5..fb24f1072 100644
--- a/docs/releases/2.6.rst
+++ b/docs/releases/2.6.rst
@@ -34,6 +34,7 @@ Other features
  * Added support for custom search handler classes to modeladmin's IndexView, and added a class that uses the default Wagtail search backend for searching (Seb Brown, Andy Babic)
  * Improved heading structure for screen reader users navigating the CMS admin (Beth Menzies, Helen Chapman)
  * Update group edit view to expose the ``Permission`` object for each checkbox (George Hickman)
+ * Improve performance of Pages for Moderation panel (Fidel Ramos)
 
 
 Bug fixes
diff --git a/wagtail/core/models.py b/wagtail/core/models.py
index 95933c065..a6fbf3bbe 100644
--- a/wagtail/core/models.py
+++ b/wagtail/core/models.py
@@ -1623,15 +1623,17 @@ class UserPagePermissionsProxy:
 
         # get the list of pages for which they have direct publish permission
         # (i.e. they can publish any page within this subtree)
-        publishable_pages = [perm.page for perm in self.permissions if perm.permission_type == 'publish']
-        if not publishable_pages:
+        publishable_pages_paths = self.permissions.filter(
+            permission_type='publish'
+        ).values_list('page__path', flat=True).distinct()
+        if not publishable_pages_paths:
             return PageRevision.objects.none()
 
         # compile a filter expression to apply to the PageRevision.submitted_revisions manager:
         # return only those pages whose paths start with one of the publishable_pages paths
-        only_my_sections = Q(page__path__startswith=publishable_pages[0].path)
-        for page in publishable_pages[1:]:
-            only_my_sections = only_my_sections | Q(page__path__startswith=page.path)
+        only_my_sections = Q(page__path__startswith=publishable_pages_paths[0])
+        for page_path in publishable_pages_paths[1:]:
+            only_my_sections = only_my_sections | Q(page__path__startswith=page_path)
 
         # return the filtered queryset
         return PageRevision.submitted_revisions.filter(only_my_sections)