Blizzard launcher updating tools
If you want to disable this calculation, go to your Launcher's Options menu, click Downloader Preferences, then check Allow quick play regardless of network speed.
That means Task Manager shows 32 tiny little performance graphs. NET really fast (lots of C /CLI these days), and is killer for working on all that multithreaded rendering code.
Game patches will update the main executable (wow.exe) to a specific version, and also write game data to your MPQ files.
All patches after Patch 4.0.1, the patches now stream parts to your computer at a time.
As such, you cannot start the game in the red phase or you will still be at the old version.
The remainder of the red calculation will be based off of your download speed to see if you can stream the MPQ files to your computer while playing at a decent rate.