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changing value of select element causes jank on OSX
Reported by
brian.ch...@gmail.com,
May 25 2016
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Issue descriptionUserAgent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/50.0.2661.94 Safari/537.36 Steps to reproduce the problem: 1. Create a web site with a <select> element and some animation 2. Monitor the frame rate w/ dev tools 3. change the value of the select element while the animation is running This problem seems to exist only on OSX. Doesn't happen on Windows or in browsers other than Chrome (Firefox, Safari) What is the expected behavior? Animation should run smoothly at or around 60fps, as long as the CPU/GPU aren't otherwise overloaded. What went wrong? After the select element is changed, there is a blocking delay of about 500ms, which is visible in the animation as well as the values reported by the frame rate monitor. Capturing a timeline in dev tools shows that during that 500ms, no scripts, GPU or other tasks are running. Did this work before? N/A Chrome version: 52.0.2730.0 Channel: canary OS Version: OS X 10.11.4 Flash Version: Shockwave Flash 21.0 r0 Here is an isolated example: https://output.jsbin.com/zozicib There are two select elements. One is connected to an event listener that affects the animation and the other is not. Changing either one causes jank.
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May 25 2016
The image is not accessible. Can you attach it here instead?
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May 26 2016
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May 26 2016
Unable to repro this issue on MAC (10.11.5) for Google Chrome Canary Version - 53.0.2748.0 Screen-recording is attached. @brian.chirls: Could you please update your Google Chrome Canary to Latest Version - 53.0.2748.0 and re-test the same on a clean profile [chrome://settings -> Add Person] and let us know your observations. Note: 1. Initially, it is starts with a jerk and becomes normal within no time. 2. There is a lot of lag while capturing the screen-recording. Thank you.
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May 26 2016
You have to change the value of the select element while the animation is running to see the jank effect. I don't see you doing that in your video. I have updated Canary and tested on a clean profile, and the effect is still there. See attached video.
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May 26 2016
Thank you for providing more feedback. Adding requester "rnimmagadda@chromium.org" for another review and adding "Needs-Review" label for tracking. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Jun 1 2016
Able to repro this issue on MAC (10.11.5) for Google Chrome Canary Version - 53.0.2753.0 Screen-recording is attached. This is a Non-Regression issue existing from M30 - # 30.0.1549.0
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Jun 1 2016
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Jul 8 2016
Moving this nonessential bug to the next milestone. For more details visit https://www.chromium.org/issue-tracking/autotriage - Your friendly Sheriffbot
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Oct 6 2016
Assigning to Alan for more triage
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Oct 10 2016
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Comment 1 by brian.ch...@gmail.com
, May 25 2016