1672414 - [XWayland] Tab switching can take a long time

Status: RESOLVED WORKSFORME

(Core :: Graphics: WebRender, defect, P3)

Description

[Andrew Osmond [:aosmond] (he/him)]

Reported in Element:

https://share.firefox.dev/31t3lhK

Using XWayland, it gets sluggish when switching tabs. We can see we block waiting for some X event. It doesn't happen with Wayland/EGL.

Comment 1

[Tatsuyuki Ishi]

Attachment: aboutsupport.json

I'm the reporter. Here's my about:support raw data.

Comment 2

[Robert Mader [:rmader]]

For the record: there are a couple of things that could be causing this - one thing being the glx vsyncsource, which we currently don't use on EGL (see also bug 1669275). We should verify that.

Comment 3

[Robert Mader [:rmader]]

Likely the same root cause as bug 1675573 - in any case blocking Xwayland.

Comment 4

[Darkspirit]

numTotalWindows 1
windowProtocol "xwayland"
desktopEnvironment "gnome"
Display0 "2560x1440 default"

A year ago I have also encountered this bug with one window, Gnome XWayland and the same screen size.
I assume switching to MOZ_X11_EGL has fixed it. bug 1640048 + bug 1695933