title: Implications of LC_ALL=C to speedup grep
body: <p>I just discovered that if i prefix my grep commands with a LC_ALL=C it does wonders for speeding grep up. </p>
  
  <p>But i am wondering about the implications.</p>
  
  <p>Would a pattern using UTF-8 not match?
  What happens if the grepped file is using UTF-8?</p>