Well, it worked well on Ubuntu 17.10, so it looks like a regression for
me. Not sure what has changed between those versions though.
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I think this is probably expected for now.
Chrome using significant CPU when tabs are open on non-trivial pages is
expected.
And Gnome Shell using noticeable CPU when any window is updating is a
known issue, but really a whole class of bugs. For a list of known
causes (subject to change), see htt