diff --git a/hgext3rd/noverify.py b/hgext3rd/noverify.py
new file mode 100644
--- /dev/null
+++ b/hgext3rd/noverify.py
@@ -0,0 +1,39 @@
+# noverify.py
+#
+# Copyright 2017 Facebook, Inc.
+#
+# This software may be used and distributed according to the terms of the
+# GNU General Public License version 2 or any later version.
+
+"""
+disables hg verify
+
+Verify can be extremely slow on large repos, so this extension disables it if
+``verify.disable`` is True::
+
+    [verify]
+    disable = true
+
+This also disables the verification step of rollback.
+"""
+
+from __future__ import absolute_import
+
+from mercurial import (
+    extensions,
+    hg,
+)
+from mercurial.i18n import _
+
+testedwith = 'ships-with-fb-hgext'
+
+def extsetup(ui):
+    extensions.wrapfunction(hg, 'verify', verify)
+
+def verify(orig, repo):
+    if repo.ui.configbool("verify", "disable", False):
+        repo.ui.warn(_("[verify] disable is set in config; skipping deep "
+                       "verification of repo\n"))
+        return 1
+    else:
+        return orig(repo)
diff --git a/tests/test-noverify.t b/tests/test-noverify.t
new file mode 100644
--- /dev/null
+++ b/tests/test-noverify.t
@@ -0,0 +1,25 @@
+  $ cat >> $HGRCPATH << EOF
+  > [extensions]
+  > drawdag=$RUNTESTDIR/drawdag.py
+  > noverify=$TESTDIR/../hgext3rd/noverify.py
+  > EOF
+
+Turn verify on and off:
+  $ hg init repo1
+  $ cd repo1
+  $ hg debugdrawdag <<'EOS'
+  > b c
+  > |/
+  > a
+  > EOS
+  $ hg verify
+  checking changesets
+  checking manifests
+  crosschecking files in changesets and manifests
+  checking files
+  3 files, 3 changesets, 3 total revisions
+  $ echo "[verify]" >> $HGRCPATH
+  $ echo "disable=1" >> $HGRCPATH
+  $ hg verify
+  [verify] disable is set in config; skipping deep verification of repo
+  [1]