title: How to improve emacs performance when view large file?
body: <p>Emacs sometimes hangs when viewing large file. But it is fast with <code>(global-font-lock-mode -1)</code>.</p>
  
  <p>I'm using a fork of Prelude.</p>
  
  <p>Emacs version: 24.3 cocoa
  System: OS X 10.8.4</p>
  
  <p>Update: I found <code>(setq jit-lock-defer-time 0.05)</code> is a method to improve the scrolling speed.</p>