Download limits change to 20 when set to 0 are slow

Highly doubt it’s a content delivery issue. I just installed Diablo IV 3 days ago and saw good speeds.

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Your ISP could be throttling gaming traffic, or there could be an issue on the PC causing the write speed to be very slow (poor performance of the drive, not enough space, permission errors, security software, etc.). Some players mentioned deleting the WMI repository as a solution for install issues, but I don’t have any official word from Blizz on that.