I'm looking solution for Radeon software high CPU usage but wow.... I also found this community is also using high CPU, it is miner?
PS, i get only 1% in opera cpu usage when i visit this site.
Id recommend you to get firefox if you dont have it. Heavy CPU can be caused by browser extensions, heavy websites with video ads and the like. this site is just some html and php/js. it cant really take so much cpu