(In reply to Anatoli Sakhnik from comment #4)
> My Acer C720 too suffers occasionally. Turning swap on/off doesn't help.
I have the same hardware. After system upgrade (current running kernel version 4.2.0) I get high CPU usage after "heavy" web site opens. If suggested workaround doesn't help (dropping caches), I just quit web browser and everything returns back to normal.
(In reply to Anatoli Sakhnik from comment #4)
> My Acer C720 too suffers occasionally. Turning swap on/off doesn't help.
I have the same hardware. After system upgrade (current running kernel version 4.2.0) I get high CPU usage after "heavy" web site opens. If suggested workaround doesn't help (dropping caches), I just quit web browser and everything returns back to normal.