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Comment by tdudhhu | Hacker News Reader

On Firefox mobile I got a score of 3.

So while Firefox is now super fast the performance of webapps might still be very bad on mobile.

And I think this applies to all modern browsers: they are fast at rendering very slow webapps and websites.

Probably hardware dependent too as I get 8.11 on my fairly old Samsung S21. My newer laptop gets 14.9 so I'm not sure whether I agree performance is "very bad" on mobile -- it may be less performant but that is surely to be expected given the hardware constraints on mobile. YMMV.

Got 7.89 on laptop with Core Ultra 155H in battery mode, 17.9 in AC mode. Zenfone 10 shows 7.75. All in Firefox.

If you’re on iOS, Apple gates Firefox from using JIT JS compilation which massively hinders performance.

E: I was wrong/extremely out-of-date - it does have JIT but relies on the Safari/Webkit implementation. In ancient versions of iOS, the WebView widget that third-party browsers were forced to use had JIT disabled, but that’s long since changed.

For this benchmark I get 12.0 in FF and 13.9 on safari. I’m glad it’s not so big of a gap as I already pay a penalty for not wanting to use safari on iOS (in terms of integration with iOS and usability from Apple’s artificial limitations on third party browsers)

It's more than that right? They have to use all of webkit. So it's pretty much a reskinned Safari in terms of layout/rendering/JS.

That’s not accurate. Firefox and all third party WebKit apps get the same JOT as Safari.

Right, but expecting the same behaviour from "Firefox" on iOS as on desktop is just not going to happen, since they have no control over the core engine. It's why, in general using iOS devices for cross-browser testing is pretty useless.

This is a fair point, though it is possible for app-level things that the browsers do to regress performance from the baseline pure engine level.

In this case, I think the 3 score must be either very old/low-end Android hardware or a measurement error. I don’t think any iOS browser gets 3.x scores, on even remotely modern hardware.

10.9 on Win10 2017 Xeon @ 4.3GHz w/ 64GB. This instance of Ffx has had ~50 tabs (across 5 containers) open for a couple of weeks.

What do these values represent? I can guess the last. Unsure of the first 2.

     96.84 ±(5.0%) 4.87 ms

Approx 6.3 and 6.7 in chrome and Firefox respectively on my low-end Pixel 6a

Weird I have the Google Pixel 8 Pro and get a score of 4.83 in Fennec and 6.61 in Vanadium (hardened chromium fork).

11.6 on s23

Sounds like old hardware or some other issue

Are you on iOS or Android?

4.7 brave on a pixel 7

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