1493493 - Firefox Wayland slower than XWayland

Status: RESOLVED WORKSFORME

(Core :: Widget: Gtk, defect, P5)

Description

[Jean-Louis Dupond]

User Agent: Mozilla/5.0 (X11; Linux x86_64; rv:64.0) Gecko/20100101 Firefox/64.0
Build ID: 20180921100113

Steps to reproduce:

I did rebuild the Firefox package on Ubuntu 18.04 with --enable-default-toolkit=cairo-gtk3-wayland. (You can find it on https://launchpad.net/~dupondje/+archive/ubuntu/ppa fyi).

Installed this package :)


Actual results:

I noticed the fonts are way sharper then on XWayland! Its really a visible improvement. But the biggest drawback is that the speed is really bad! The browsing experience is really slow :(


Expected results:

I would expect that Firefox Wayland is faster on Wayland then the XWayland version. But seems this is not the case!

It might be I need to enable some additional options in about:config? But then, why are they not enabled by default? :)

Comment 1

[Emilio Cobos Álvarez (:emilio)]

Let's try Widget: GTK first given the description :)

Comment 2

[Jean-Louis Dupond]

The thing that is a real disaster is typing. Your cursor lag is like 30 seconds (for real) :(

Comment 3

[Christian Stadelmann]

> I noticed the fonts are way sharper then on XWayland! Its really a visible improvement.

Is it possible that you are running Firefox on a monitor with HiDPI? Afaik, Xorg/Xwayland has no (good) support for HiDPI, at least not with Gtk+, but on Wayland it does. As a result, Firefox has to do much more work to render much more pixels which may be the cause for higher CPU usage causing slowness.

> The thing that is a real disaster is typing. Your cursor lag is like 30 seconds (for real) :(

What is your Wayland compositor? If it is GNOME shell, you may be seeing a few known bugs in GNOME shell/mutter, e.g. https://bugzilla.redhat.com/show_bug.cgi?id=1565931

Comment 4

[tarkasteve]

I'm not seeing any obvious performance problems with my master build with a HiDPI display. Could you try that? My .mozconfig looks like:

    . $topsrcdir/browser/config/mozconfig

    ac_add_options --disable-crashreporter
    ac_add_options --disable-tests
    ac_add_options --disable-updater

    ac_add_options --enable-default-toolkit=cairo-gtk3-wayland
    ac_add_options --enable-release

    ac_add_options --libdir="$LIBDIR"
    ac_add_options --prefix="$PREFIX"

    mk_add_options AUTOCLOBBER=1
    mk_add_options BUILD_OFFICIAL=1
    mk_add_options MOZILLA_OFFICIAL=1
    mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/objdir

This is on Debian testing, Gnome Shell/Mutter 3.30, external 3840x2160 display, Intel HD integrated graphics (i915).

Comment 5

[Martin Stránský [:stransky] (ni? me)]

(In reply to Jean-Louis Dupond from comment #2)
> The thing that is a real disaster is typing. Your cursor lag is like 30
> seconds (for real) :(

I see it also on Fedora 28/XWayland/Gtk 3.22/X11 Firefox sometime, may be related to mutter/gnome-shell. I'm really looking forward to use a different compositor.

Anyway, I don't see Wayland related performance issues on Fedora 28/Gtk 3.22 - it may be related to 3.30 which is pretty fresh.

Comment 6

[Jean-Louis Dupond]

(In reply to Christian Stadelmann from comment #3)
> What is your Wayland compositor? If it is GNOME shell, you may be seeing a
> few known bugs in GNOME shell/mutter, e.g.
> https://bugzilla.redhat.com/show_bug.cgi?id=1565931

=> I'm using Gnome/mutter indeed!

Tried upgrading mutter (updating to Ubuntu 18.10), but have to test a new build of Firefox with Wayland enabled first. (To bad there isn't a wayland nightly :))

Comment 7

[Martin Stránský [:stransky] (ni? me)]

(In reply to Jean-Louis Dupond from comment #6)
> (In reply to Christian Stadelmann from comment #3)
> > What is your Wayland compositor? If it is GNOME shell, you may be seeing a
> > few known bugs in GNOME shell/mutter, e.g.
> > https://bugzilla.redhat.com/show_bug.cgi?id=1565931
> 
> => I'm using Gnome/mutter indeed!
> 
> Tried upgrading mutter (updating to Ubuntu 18.10), but have to test a new
> build of Firefox with Wayland enabled first. (To bad there isn't a wayland
> nightly :))

Wayland nightly is available as flatpak at https://firefox-flatpak.mojefedora.cz/

Comment 8

[Darkspirit]

Omg, I had tomatoes on my eyes and only noticed the first sentence. https://mozilla.logbot.info/gfx/20180923#c15359424-c15359429 Sorry!

Comment 9

[[:estemal]]

I confirm this. I've compiled firefox with wayland backend an got very poor performance (it literally took several seconds to respond to my actions). I rebuilt it with the default backend and it runs nice and smooth. I use sway BTW.

Comment 10

[Jan Pokorný]

Same experience with sway (1.0 beta, wlroots backend) as in [comment 9].

Comment 11

[jon]

Doing a bit of testing here, this slowness exists with the Flatpak Nightly build under Sway/wlroots git master as mentioned by others, but -not- under Plasma 5.14's Wayland session.  Plasma does exhibit other bugs, such as not being able to click on menus in Firefox's Wayland session.

Comment 12

[dano.kutka]

I can confirm very bad performance with Sway (master). Using Weston or Gnome performance is much better.
I am using Fedora 29, gpu Intel 520, latest Firefox Nightly.

Comment 13

[Firefox Bug Husbandry Bot]

https://bugzilla.mozilla.org/show_bug.cgi?id=1552613

Comment 14

[dano.kutka]

This issue was fixed (for me) couple months ago. Performance is actually better then on XWayland, especially with webrender. Anybody still experiencing this?

Comment 15

[Martin Stránský [:stransky] (ni? me)]

Thanks for the info, closing.