lib/PublicInbox/V2Writable.pm | 6 ++++++

diff --git a/lib/PublicInbox/V2Writable.pm b/lib/PublicInbox/V2Writable.pm
index fd93ac2732ee575c365bec3c6468466434e3acde..76844cd45a0f046b91a35263e9de046899f37f77 100644
--- a/lib/PublicInbox/V2Writable.pm
+++ b/lib/PublicInbox/V2Writable.pm
@@ -831,6 +831,12 @@ 		$pr->("$i.git indexing all of $tip") if $pr;
 		return $tip; # all of it
 	};
 
+	# fast equality check to avoid (v)fork+execve overhead
+	if ($cur eq $tip) {
+		$sync->{ranges}->[$i] = undef;
+		return;
+	}
+
 	my $range = "$cur..$tip";
 	$pr->("$i.git checking contiguity... ") if $pr;
 	if (is_ancestor($git, $cur, $tip)) { # common case