From:  Till Schneidereit <till@tillschneidereit.net>
Date:  29 Jan 2017 05:32:34 Hong Kong Time
Newsgroup:  news.mozilla.org/mozilla.dev.tech.js-engine.internals
Subject:  

Re: JS engine multithreading

NNTP-Posting-Host:  63.245.214.181

On Sat, Jan 28, 2017 at 7:36 PM, Emilio Cobos Álvarez 
wrote:

> > - Servo is using a setup that includes many runtimes (roughly one per
> zone
> > group, other terminology notwithstanding) to achieve goals similar to
> > Quantum DOM. I can't find it right now, but I think we even have a demo
> > showing smooth animation in one frame while another frame is suffering
> from
> > GC jank.
>
> I believe this is the URL you were looking for (though I think the ad
> should be cross-origin, which is not true in that demo page):
>
>   https://servo.org/bhtml-newtab/webrender-demos/evil_
> ad/physics/with-ad.html
>

In this demo the jank is caused by a long-running script in the banner ad.
I thought I had seen one about GC jank, but I'm probably misremembering.