adblock shows a minero.cc blob downladed which can be blocked and fixes the CPU use.
just have a look. https://minero.cc/
people are going crazy...
source can be edited on every point in the chain (your modem, your ISP, the hoster of the board, ...) so i'm not pointing the finger at anyone,
but since we are multiple users with different profiles (country, browser, OS, ISP...), i think you, admins, should have a deep look at this.