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Comment by lwansbrough | Hacker News Reader

I know it’s not officially released, so I’m hoping it gets fixed, but FF57 rips through my Mac’s battery life and runs insanely hot on simple JS apps. I still use it daily because it generally works, but there are a few apps I just have to go to Chrome for.

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I guess you should open a bug report on https://bugzilla.mozilla.org/

Mention Quantum Flow and "performance" in it. It worked for me in the past that performance issues I had were solved within a few weeks or days.

Make sure to attach a performance profile with https://perf-html.io/ using the linked add-on there.

Firefox 57 doesn’t have WebRender on unless you explicitly turn it on; did you? It would be reasonale not to, as it’s still kinda buggy.

Didn’t know that! I’ll be honest I was wondering what the hype was about because it didn’t seem that fast to me...

57 does contain a number of faster things, just not specifically the work the article is talking about. Now that 57 is in beta, I’d imagine that the developer-focused blogs are talking about future things.

The new improvements to Firefox fall under a project called "Quantum". Firefox 57 is merely the first Firefox release to have any Quantum components enabled, in particular Quantum CSS (a.k.a. Servo's CSS engine, Stylo) and Quantum Flow (which is a general umbrella project for making Firefox UI more responsive). Here are the others: https://wiki.mozilla.org/Quantum

I think it's still in Nightly which is 58 now. I'm running 57 beta on Win10 and my about:support page says "unavailable by runtime: Build doesn't include WebRender".

I think WebRender is still off by default in 58 Nightly.

Right, but "off by default" is different from "not included in this build".

Same here. FF has always performed poorly on my 15” 2015 rMBP, but this made it worse.

I suggest reporting a bug to Bugzilla. The positive side effect will be you will see how efficiently they handle such reports. And you will get it fixed.

I'm pretty sure they are aware of it.

I have the same issues on Linux. It's really fast, but often it hogs one core completely and the CPU does a lot of work, sending the fans in overdrive. Especially when videos are involved.

Let's hope things get ironed until a stable release in november

As said in sibling: Open a bug report at https://bugzilla.mozilla.org/

Mention Quantum Flow and "performance" in it. Make sure to attach a performance profile with https://perf-html.io/ using the linked add-on there.

I had many cases where the mozilla devs were glad about such bug reporst (especially if you are on Linux - I am too :) - which is not so often used and reported like Windows or Mac)

Done: https://bugzilla.mozilla.org/show_bug.cgi?id=1407536

We're aware that there seems to be a problem, but we can't reproduce it yet: https://bugzilla.mozilla.org/show_bug.cgi?id=1404042 Any additional data points, test cases etc. are appreciated.

I filed a new report here, with perf.html attached: https://bugzilla.mozilla.org/show_bug.cgi?id=1407536

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