Comment 1 for bug 776776

I don't really know (for now). But using a task / process manager increases the CPU usage a lot, because of the continuous scanning of threads in RAM. Try gnome-system-monitor and you'll see your CPU usage increasing up to 100%. If problem persists without using monitors the it's another problem. The theme was tested (a lot) for checking its resources hungry and it must be as fast as any other Cairo based theme (like Elementary or Deepin).

Anyway I'll keep it an eye.