The VIPRE Web Filter causes the download speed for the Blizzard Launcher (BlizzardLauncher.exe) to drop significantly.
Disable the Web Filter when running the Blizzard Launcher application if it is attempting to download data from the internet.
The Web Filter analyzes data as it is passed through port 80. This process causes a delay in the transmission of data. This delay directly impacts the speed at which the Blizzard Launcher is able to download data from the internet.