High CPU usage when moving mouse over the tab bar, address bar, and bookmarks bar
Reported by
a...@aaomidi.com,
Jun 15 2018
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Issue descriptionUserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/67.0.3396.87 Safari/537.36 Steps to reproduce the problem: 1. Open browser and open around 10 tabs 2. Open the chrome task manager 3. Move mouse over elements on the top UI and watch cpu usage rise What is the expected behavior? CPU usage shouldn't peak to maximum. What went wrong? CPU usage peaked to maximum. Did this work before? N/A Chrome version: 67.0.3396.87 Channel: stable OS Version: 10.0 Flash Version: Shockwave Flash 30.0 r0
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Jun 18 2018
amir@ Thanks for the issue. Tested this issue on Windows 10 and Mac OS 10.13.5 on the reported version 67.0.3396.87 and the latest Canary 69.0.3463.0 by following the given steps above. On opening more than 10 tabs and moving the mouse over the tab bar, address bar, and bookmarks bar, cannot find any increase in CPU usage in Chrome task manager. Attached is the screen cast for reference. Request you to retry the issue on a new chrome profile without any flags/extensions and update the thread with the observations. Thanks..
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Jun 28 2018
Thanks for the report. I don't think this is an issue, at least as I understand it. First, I don't think the CPU usage you're seeing is because you're moving the mouse. Instead, having the task manager open, which has to look at all subprocesses and what they're running, takes CPU. I don't think it'll ever be zero. (The initial display of all 0.0% CPU usage when you open task manager is simply because it takes a little time to collect and revise the data.) The CPU usage when you switch tabs also makes sense. When you switch to a new renderer process (tab), it has to bring data back into memory and redraw the screen. That takes CPU time. Am I misunderstanding the complaint?
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Nov 23
*** UI Mass Triage *** Unable to reproduce the issue, if this bug still reproduces for you, please reopen or file a new issue. Thanks! |
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Comment 1 by susan.boorgula@chromium.org
, Jun 17 2018