https://bugs.kde.org/show_bug.cgi?id=330954
--- Comment #38 from James <ja...@nurealm.net> --- Another 2 1/2 years on, I am no longer seeing this problem on my system. On Arch Linux, with: linux 4.13.4-1 kwin 5.10.5-1 running a triple head Radeon 5570, and setting: System Settings -> Display and Monitor -> Compositor -> Tearing prevention ("vsync"): -> Never Starting a clean session, starting Firefox, then switching to a text console, CPU usage is normal. Hopefully, this is no longer an issue for anyone. -- You are receiving this mail because: You are watching all bug changes.