From aa3405cb2b5fe22e5e68b0b3ed7bc1c1937d2928 Mon Sep 17 00:00:00 2001
From: Nathan Sobo <nathan@github.com>
Date: Thu, 1 Nov 2012 14:09:58 -0600
Subject: [PATCH] Cache the memory contents of `Buffer` for better performance

---
 src/app/buffer.coffee | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/app/buffer.coffee b/src/app/buffer.coffee
index 699eba79f..62834a599 100644
--- a/src/app/buffer.coffee
+++ b/src/app/buffer.coffee
@@ -14,6 +14,7 @@ class Buffer
   @idCounter = 1
   undoManager: null
   cachedDiskContents: null
+  cachedMemoryContents: null
   conflict: false
   lines: null
   file: null
@@ -96,7 +97,7 @@ class Buffer
       null
 
   getText: ->
-    @lines.join('\n')
+    @cachedMemoryContents ?= @lines.join('\n')
 
   setText: (text) ->
     @change(@getRange(), text)
@@ -205,6 +206,7 @@ class Buffer
 
   replaceLines: (startRow, endRow, newLines) ->
     @lines[startRow..endRow] = newLines
+    @cachedMemoryContents = null
     @conflict = false if @conflict and !@isModified()
 
   pushOperation: (operation, editSession) ->