Chrome Version: 60.0.3091.0
OS: macOS 10.12

What steps will reproduce the problem?
(1) Visit dailykos.com (site archived at https://drive.google.com/open?id=0BwcLL5PHtZQHWF9FelZ5cDJxVnc ) and let the ads settle down

What is the expected result?
Safari and Chromium renderers should consume the same amount of CPU.

What happens instead?
Safari's renderer consumes 1.2% vs. Chromium's at 5.8%. Quartz Debug shows no screen updates. JavaScript profiling shows painting activity (should not be any given that the page is not redrawing).
 

Deleted: dailykos-Profile-20170522T144135.zip 614 KB

dailykos-Profile-20170522T144135.zip 614 KB Download