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How Stylo Brought Rust and Servo to Firefox

bholley.net

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Re: How Stylo Brought Rust and Servo to Firefox

#3

Post by muizelaar »

pitaj wrote: post #2

One thing I've noticed about Firefox, especially on mobile, is that transform animations are pretty janky. Does anyone know if this is being worked on? Should I submit a bug report?

There are no known issues about this. You should submit a bug report.

Re: How Stylo Brought Rust and Servo to Firefox

#4

Post by pcwalton »

pitaj wrote: post #2

One thing I've noticed about Firefox, especially on mobile, is that transform animations are pretty janky. Does anyone know if this is being worked on? Should I submit a bug report?

Feel free to file a bug report with your hardware, Firefox version, and test case, yes. These often boil down to simple bugs (hardware-specific or page-specific) that can be quickly fixed when isolated.

The medium-term effort to revamp the graphics stack is WebRender. Note that, like Stylo, WebRender is not just meant to achieve parity with other browsers. It's a different architecture entirely that is more similar to what games do than what current browsers do.

Re: How Stylo Brought Rust and Servo to Firefox

#5

Post by spiderfarmer »

pcwalton wrote: post #4
pitaj wrote: post #2

One thing I've noticed about Firefox, especially on mobile, is that transform animations are pretty janky. Does anyone know if this is being worked on? Should I submit a bug report?

Feel free to file a bug report with your hardware, Firefox version, and test case, yes. These often boil down to simple bugs (hardware-specific or page-specific) that can be quickly fixed when isolated. The medium-term effort to revamp the graphics stack is WebRender. Note that, like Stylo, WebRender is not just meant to achieve parity with other browsers. It's a different architecture entirely that is more similar t…

Firefox’ CSS transform/animation performance is terrible on macOS. I filed a bugreport but there’s no interest in solving it unfortunately.

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

Re: How Stylo Brought Rust and Servo to Firefox

#6

Post by pcwalton »

spiderfarmer wrote: post #5
pcwalton wrote: post #4

Earlier quoted context omitted.

Feel free to file a bug report with your hardware, Firefox version, and test case, yes. These often boil down to simple bugs (hardware-specific or page-specific) that can be quickly fixed when isolated. The medium-term effort to revamp the graphics stack is WebRender. Note that, like Stylo, WebRender is not just meant to achieve parity with other browsers. It's a different architecture entirely that is more similar t…

Firefox’ CSS transform/animation performance is terrible on macOS. I filed a bugreport but there’s no interest in solving it unfortunately. https://bugzilla.mozilla.org/show_bug.cgi?id=1407536

Those are very general conclusions to draw from one test case. The bouncing ball test runs at 60 FPS for me on macOS; most of the time is spent in painting, as expected. Likewise, Stripe scrolls at 60 FPS for me.

I should note that the bouncing ball test is the kind of thing that WebRender is designed to improve—painting-intensive animations—so it's obviously untrue that there's no interest in improving this sort of workload. When running your bouncing ball test in Servo with master WebRender, I observed CPU usage of no higher than 15% (as well as 60 FPS)…

Re: How Stylo Brought Rust and Servo to Firefox

#8

Post by kbenson »

spiderfarmer wrote: post #5
pcwalton wrote: post #4

Earlier quoted context omitted.

Feel free to file a bug report with your hardware, Firefox version, and test case, yes. These often boil down to simple bugs (hardware-specific or page-specific) that can be quickly fixed when isolated. The medium-term effort to revamp the graphics stack is WebRender. Note that, like Stylo, WebRender is not just meant to achieve parity with other browsers. It's a different architecture entirely that is more similar t…

Firefox’ CSS transform/animation performance is terrible on macOS. I filed a bugreport but there’s no interest in solving it unfortunately. https://bugzilla.mozilla.org/show_bug.cgi?id=1407536

> With the page at stripe.com, I don't see any difference between FF52ESR, FF56.0.2, FF57.0b14 with servo enabled, or with it disabled. On my 2012 Macbook Air with macOS 10.12, I see about 98-108% CPU on each, according to iStat Menus CPU meter. With Safari it's about 35%. That's exactly what I would expect based on past experience.

> I would probably close this as invalid, as it's not something new or specific to Quantum or Servo, or as a duplicate of one of the older bugs, though I'm not sure which.

That likely points as to why there's little movement on this bug. It's title can be interpreted to indicate a Quantum regression, but it's a general issue that's longstanding, so it may be the people that are seeing it are not focused on it (they're likely tracking down and fixing actual regressions, not known problems).

I know that doesn't help your issue, but it may help you locate the relevant bug report and lend your weight there, if you feel so inclined.

Re: How Stylo Brought Rust and Servo to Firefox

#9

Post by wyldfire »

Anecdote regarding this new FF:

I would find frequent cases where my system would stall for 10-20s (could not caps lock toggle, pointer stopped moving). I almost always have just Chrome and gnome-terminal open (Ubuntu 16.04). I had attributed it to either a hardware or BIOS/firmware defect.

Now, after switching to Firefox I have gone a week without seeing those stalls.

YMMV -- I never bothered to investigate, it could be something as simple as slightly-less-memory-consumption from FF, or still a hardware defect that FF doesn't happen to trigger.

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