GNOME Web - youtube videos are choppy

Epic: https://source.puri.sm/Librem5/use-cases/issues/51

What application is this relating to?

GNOME Web

What problem did you encounter

What is the actual behaviour?

Playing youtube videos is very choppy

What is the expected behaviour?

Playing youtube videos is smooth

How to reproduce

1. go to https://www.youtube.com/watch?v=aqz-KE-bpKQ
2. Play video and watch the choppiness

Which version did you encounter the bug in?

• I compiled it myself. If you compiled the application from source please provide the git revision via e.g. by running git log -1 --pretty=oneline and pasting the output below.

• I used a precompiled Debian package. Please paste the output of dpkg -s <package name> below.

• I used a prebuilt flatpak. Please paste the output of flatpak info <application-id> below.

• I used something else (please elaborate).

purism@pureos:~$ dpkg -l | grep epiphany
ii  epiphany-browser                     3.32.1.2-2                                     arm64        Intuitive GNOME web browser
ii  epiphany-browser-data                3.32.1.2-2                                     all          Data files for the GNOME web browser
purism@pureos:~$ uname -a
Linux pureos 5.2.0-rc5-gfd2301817 #1 SMP PREEMPT Tue Jun 18 14:18:27 PDT 2019 aarch64 GNU/Linux

What hardware are you running on?

• amd64 qemu image
• Librem5 devkit (please list what build number you are running)
• other (please elaborte)

Relevant logfiles

Please provide relevant logs. Since the relevant log files can vary depending on the application, here are some tips for gathering helpful logs:

• If you compiled the application yourself, the build log would be helpful.
• If you used a prebuilt debian package, you can provide the logs on an app with journalctl -b 0 | grep "<application-name>".

purism@pureos:~$ sudo journalctl -b 0 | grep epiphany
Jun 25 04:23:28 pureos epiphany[882]: Error retrieving accessibility bus address: org.freedesktop.DBus.Error.ServiceUnknown: The name org.a11y.Bus was not provided by any .service files
Jun 25 04:23:29 pureos phosh[535]: 2019-06-25 04:23:29 - [rootston/xdg_shell.c:412] new xdg toplevel: title=Blank page, app_id=epiphany