Limiting download bandwidth causing cpu load

I had battlenet set to download future updates at a limited download bandwidth. I noticed that one core on my cpu was pegged at 100% usage today and cpu voltage was running at 1.45v and 80C on a custom loop. I don’t even hit those temps when running a game. I started killing tasks to see what resolved the issue. After finding the problem was battlenet I start changing settings. Disabling the bandwidth limit dropped cpu usage and cpu temps dropped to 30C. I enabled the limit again and core temps instantly went back up to 80C.