high cpu usage via battle.net desktop client

Bug Report
I had just rebooted my computer and realized that the battle.net client is using 10% of CPU power. I was wondering what happened and realized that it's trying to do some background download for the future update available to Overwatch.

Initially, I thought it was running at full speed, thus the high cpu usage.

However, it turned out to be completely opposite. When I uncapped the bandwidth (setting the 0 for unlimited), the cpu usage instantly dropped to 1%.

If I set any bandwidth restriction, I tried from 100KB/s to 6000KB/s, the CPU usage instantly goes back up.

here are 2 screenshot that I took
https://photos.app.goo.gl/p24C7Kv87iMgkw8R7

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