From 169c6b63729e4468fc4e093abebad708e7336a22 Mon Sep 17 00:00:00 2001
From: leekelleher <leekelleher@gmail.com>
Date: Sat, 25 Mar 2017 12:50:53 +0000
Subject: [PATCH] Fixes U4-9678 - XPath Syntax Parser slowdown

http://issues.umbraco.org/issue/U4-9678

Swaps out the base XPath from `"descendant::*[@id={0}]"` to `"id({0})"` - making use of the content-cache's XML DTD ID index.

This will perform better on larger content-trees.
---
 src/Umbraco.Core/Xml/UmbracoXPathPathSyntaxParser.cs | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/src/Umbraco.Core/Xml/UmbracoXPathPathSyntaxParser.cs b/src/Umbraco.Core/Xml/UmbracoXPathPathSyntaxParser.cs
index 7802ddc438..016a3e45dd 100644
--- a/src/Umbraco.Core/Xml/UmbracoXPathPathSyntaxParser.cs
+++ b/src/Umbraco.Core/Xml/UmbracoXPathPathSyntaxParser.cs
@@ -60,7 +60,7 @@ namespace Umbraco.Core.Xml
                 return -1;
             });
 
-            const string rootXpath = "descendant::*[@id={0}]";
+            const string rootXpath = "id({0})";
 
             //parseable items:
             var vars = new Dictionary<string, Func<string, string>>();