Tried on both 18.04 (gnome-shell version 3.28.3 and 3.28.1) and 18.10 (3.30.1). No extensions at all.
Got cpu usage changing from 20% to 90% just moving mouse around.
3.28.1 behaviour is slightly better: from 15% to 30-40%
Tried on both 18.04 (gnome-shell version 3.28.3 and 3.28.1) and 18.10 (3.30.1).
No extensions at all.
Got cpu usage changing from 20% to 90% just moving mouse around.
3.28.1 behaviour is slightly better: from 15% to 30-40%