diff --git a/mercurial/commands.py b/mercurial/commands.py
--- a/mercurial/commands.py
+++ b/mercurial/commands.py
@@ -2621,6 +2621,11 @@
     if bookmark and changesets:
         raise error.Abort(_(b"-r and -B are mutually exclusive"))
 
+    if not bookmark and not changesets:
+        # Avoid loading obsmarkers if we're accessing only the working copy
+        # parent (which will never be hidden).
+        repo = repo.unfiltered()
+
     if bookmark:
         if bookmark not in repo._bookmarks:
             raise error.Abort(_(b"bookmark '%s' not found") % bookmark)