From 68315cea8ad317483914163f0b158ff2b2c61f38 Mon Sep 17 00:00:00 2001
From: ashmaroli <ashmaroli@users.noreply.github.com>
Date: Wed, 14 Mar 2018 16:22:30 +0530
Subject: [PATCH] memoize document output extension (#6814)

Merge pull request 6814
---
 lib/jekyll/document.rb | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/jekyll/document.rb b/lib/jekyll/document.rb
index 1485672f..66668e5a 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -90,7 +90,7 @@ module Jekyll
     #
     # Returns the output extension
     def output_ext
-      Jekyll::Renderer.new(site, self).output_ext
+      @output_ext ||= Jekyll::Renderer.new(site, self).output_ext
     end
 
     # The base filename of the document, without the file extname.