diff --git a/mercurial/scmutil.py b/mercurial/scmutil.py
--- a/mercurial/scmutil.py
+++ b/mercurial/scmutil.py
@@ -491,7 +491,9 @@
 
     revset = repo.ui.config('experimental', 'revisions.disambiguatewithin')
     if revset:
-        revs = repo.anyrevs([revset], user=True)
+        if not util.safehasattr(repo, '_cacheddisambiguationrevs'):
+            repo._cacheddisambiguationrevs = repo.anyrevs([revset], user=True)
+        revs = repo._cacheddisambiguationrevs
         if cl.rev(node) in revs:
             hexnode = hex(node)
             for length in range(minlength, len(hexnode) + 1):