title: TortoiseSVN very slow on some windows configurations
body: <p>I’m experiencing performance issues with tortoiseSVN client and xp-dev server :
  It take 19 minutes to check out 718kBytes in 297 files !
  PC is running windows XP, latest version of T-SVN. I’ve disabled firewall and antivirus with the same result.
  I made another test on a second machine (same internet connexion, antivirus and firewall on) running Vista and it takes 19 seconds !
  So it looks like it’s not an internet connexion nor an antivirus/firewall problem.</p>
  
  <p>Any clue what it can be ? Maybe I have to configure something on the XP machine ? Subversion config ?</p>
  
  <p>Help greatly appreciated to solve this very annoying problem.</p>
  
  <p>Julien</p>