Chrome Version: 64.0.3282.39
OS: macOS 10.12

What steps will reproduce the problem?
(1) Reboot machine
(2) Launch Chrome

What is the expected result?
The GPU process should be idle if no renderers are active.

What happens instead?
The GPU process is consuming 77% CPU (1.2GB address space) and the browser process (as a result) 99% CPU. The most-active renderer process is consuming 1.5% CPU, i.e. it is inactive, or at least not doing enough to warrant 77% CPU from the GPU process. Quartz Debug shows that no drawing is being pushed to the screen.

Attached are Activity Monitor samples from the GPU and browser processes, and about gpu. Here are my Finch variations:

c134752e-b8b72c88
1e528f0f-ca7d8d80
b130ecb8-1410f10
38eb801c-3f4a17df
7c1bc906-8122a015
d52c4ff7-f23d1dea
47e5d3db-3d47f4f4
b1edbc38-c306c9a2
459a590c-2cec5d20
f9884634-a3b30566
b21cf1cf-803f8fc4
57f575bb-3f4a17df
d0ecf1da-12de74c0
f347910c-65bced95
77bbdddc-e08c81ee
9773d3bd-f23d1dea
93731dca-e89d496c
8e3b2dc5-93702590
9e5c75f1-6330dd97
2981bcb4-3f4a17df
f79cb77b-3f4a17df
4ea303a6-87f08c4f
d92562a9-ca7d8d80
90bcbadc-e4d47f33
25fc488a-4d2fac87
1bced4a3-59ba3fef
ad6d27cc-1627c3cf
757a5d98-28165b59
b2f0086-93053e47
ef25c1eb-f23d1dea
4bc337ce-504c1843
1354da85-f34af386
17507c76-3d47f4f4
494d8760-6843eff2
3ac60855-3ec2a267
f296190c-2a02aa27
4442aae2-6e3b1976
ed1d377-e1cc0f14
75f0f0a0-e1cc0f14
e2b18481-92bb99a9
e7e71889-4ad60575
f5fff3a2-f23d1dea
94e68624-803f8fc4
f141d4bc-65bced95
da4aaa01-3f4a17df
 

Deleted: GPUSample.txt 4.3 MB

GPUSample.txt 4.3 MB View Download

Deleted: BrowserProcessSample.txt 910 KB

BrowserProcessSample.txt 910 KB View Download

Deleted: aboutgpu.htm 65.1 KB

aboutgpu.htm 65.1 KB View Download