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Elements inspect laggy and unresponsive
Reported by
t...@ethercreative.co.uk,
Sep 15 2017
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_12_6) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.79 Safari/537.36 Steps to reproduce the problem: 1. Visit any website 2. Open Devtools Elements inspector 3. Start hovering elements to highlight them on the page What is the expected behavior? The hovered element should be instantly highlighted on the page. What went wrong? There is a noticeable delay anywhere up to 1s before the element is highlighted on the page. The faster you hover between elements, the more delayed the highlighting gets, sometimes hanging on a previously highlighted element until you stop moving the mouse to let it catch up. All other sections in devtools work fine. Expanding DOM elements to show children is fine for the most part, but can start lagging when it is struggling to highlight. Resizing the window is also very laggy, but only when devtools is open. Did this work before? Yes 59 Chrome version: 61.0.3163.79 Channel: stable OS Version: OS X 10.12.6 Flash Version: It seems to be related to screen size. The larger the screen, the laggier the highlighting. This issue is consistent across 3 separate iMacs (5k retina, 27-inch, late 2015, one with 24gb ram) and a MacBook Pro (retina, mid-2012).
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Sep 18 2017
@pnangunoori Thanks for getting back to me. I've done some tests (removed extensions & created a new profile as you suggested), and I think I've found the culprit. Rulers. Enabling rulers in devtools completely tanks performance, with them disabled everything runs smoothly. I've attached the version info from my main profile in Chrome. Let me know if you need any more info!
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Sep 18 2017
Thank you for providing more feedback. Adding requester "pnangunoori@chromium.org" to the cc list and removing "Needs-Feedback" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Sep 20 2017
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Sep 20 2017
Unable to reproduce the issue in MacBook Pro (Retina, 15-inch, Mid 2014), 10.12.6 using chrome stable version #61.0.3163.91 and latest canary #63.0.3220.0. Following are the steps followed to reproduce the issue. ------------ 1. Visited www.facebook.com and www.yahoo.com 2. Opened Devtools Elements inspector and enabled rulers from settings in devtools. 3. Started hovering elements to highlight them on the page. 4. Observed that hovered element instantly got highlighted on the page without any delay. Attached screen cast for reference. Reporter@ - Could you please verify the screen cast and please let us know if anything missed from our side. Requesting dev from Blink>Canvas team to please have a look into the issue. Thanks...!!
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Sep 20 2017
I've attached two screencasts. The first is with rulers enabled / disabled, showing inspecting and expanding elements. The second is resizing the window with inspect open / closed, showing very delayed re-renders (probably the wrong term, but you'll see what I mean) of the page. This is with rulers disabled, so I assume they're more of a symptom rather than the cause.
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Sep 20 2017
Thank you for providing more feedback. Adding requester "krajshree@chromium.org" to the cc list and removing "Needs-Feedback" label. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Sep 21 2017
Re-tried the issue again on Mac 10.12.6 on the latest Canary 63.0.3221.0 and latest Stable 61.0.3163.91 and unable to reproduce the issue. Can someone from Blink>Canvas team please look into this issue and help in further triaging. Thanks..
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Sep 25 2017
Repro requires a divice with a non-sRGB color profile (most Macs), lag is especially perceptible on machines with a devicePixelRatio > 1 (e.g. Retina display) This is fixed in Chrome 62 (currently in beta) |
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Comment 1 by pnangunoori@chromium.org
, Sep 18 2017Labels: Needs-Triage-M61 Needs-Feedback
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