ksysguard takes itself 2.6% with no increase from Xorg and kwin_x11
My point is that for 16.04, GNOME System Monitor worked just fine with 16.10, straight upgrade, it eats 10% of idle cpu time on 2 core hyper-threading
Something changed between Plasma 5.5.5 and 5.7.5, X, i915
ksysguard takes itself 2.6% with no increase from Xorg and kwin_x11
My point is that for 16.04, GNOME System Monitor worked just fine
with 16.10, straight upgrade, it eats 10% of idle cpu time on 2 core hyper-threading
Something changed between Plasma 5.5.5 and 5.7.5, X, i915