From 0d7cddaad03c83958a36d8ec5db390b350e3bbef Mon Sep 17 00:00:00 2001
From: Parker Moore <parkrmoore@gmail.com>
Date: Thu, 3 Aug 2017 22:15:04 -0400
Subject: [PATCH] Memoize the return value of Document#url

Running 'bundle exec rake site:generate' locally, this brings generation time from 16 seconds down to 8 seconds.
---
 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 b6493f3c075..d42e544c62f 100644
--- a/lib/jekyll/document.rb
+++ b/lib/jekyll/document.rb
@@ -204,7 +204,7 @@ def permalink
     #
     # Returns the computed URL for the document.
     def url
-      @url = URL.new({
+      @url ||= URL.new({
         :template     => url_template,
         :placeholders => url_placeholders,
         :permalink    => permalink,