If you are logged off and won’t play for a while, after exiting the game go to your wow folder. Click the Blizzard Background Downloader. Once launched allow it to download. Patch 2.1 seems to be near each day. Today you can download additional files—to get ready for the patch day.
Following this procedure you can guarantee that patch day won’t be a long download preventing you from login in immediately in case you have a raid schedule.
