Poor performance with Wayland

When running Gnome 3 in Wayland mode (confirmed with XDG_SESSION_TYPE env var) I see the following issues on this hardware:

* Jerky animations (glxgears stutters noticably)
* Mouse cursor sometimes updated at a reduced framerate, usualy when CPU is under load, appearing to worsen over time (> 8 hours uptime)
* High CPU usage when mousing over icons in left-hand side Unity dock (20-30%), also causing mouse cursor to stutter
* 15fps in Kodi and poor video playback framerate
* 30-40% CPU usage in Kodi when program idle
* Gnome shell frequently using 25% of CPU or more

All issues disappear when using x11 mode (again confirmed with XDG_SESSION_TYPE env var). Performance in that case seems as good as 17.04

ProblemType: Bug
DistroRelease: Ubuntu 17.10
Package: xorg 1:7.7+19ubuntu3
ProcVersionSignature: Ubuntu 4.13.0-16.19-generic 4.13.4
Uname: Linux 4.13.0-16-generic x86_64
.tmp.unity_support_test.0:

ApportVersion: 2.20.7-0ubuntu3.1
Architecture: amd64
BootLog:
 * Setting up X socket directories... 
[ OK ]
  * Restoring resolver state... 
[ OK ]
 Starting jabber server: ejabberd
CompizPlugins: [core,composite,opengl,compiztoolbox,decor,vpswitch,snap,mousepoll,resize,place,move,wall,grid,regex,imgpng,session,gnomecompat,animation,fade,unitymtgrabhandles,workarounds,scale,expo,ezoom,unityshell]
CompositorRunning: None
CurrentDesktop: ubuntu:GNOME
Date: Thu Nov 9 13:03:08 2017
DistUpgraded: 2017-11-07 09:38:15,448 DEBUG icon theme changed, re-reading
DistroCodename: artful
DistroVariant: ubuntu
DkmsStatus:
 virtualbox, 5.1.30, 4.10.0-37-generic, x86_64: installed
 virtualbox, 5.1.30, 4.13.0-16-generic, x86_64: installed
ExtraDebuggingInterest: Yes, including running git bisection searches
GraphicsCard:
 Advanced Micro Devices, Inc. [AMD/ATI] Wrestler [Radeon HD 6310] [1002:9802] (prog-if 00 [VGA controller])
   Subsystem: ZOTAC International (MCO) Ltd. Wrestler [Radeon HD 6310] [19da:a191]
InstallationDate: Installed on 2011-12-05 (2165 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.13.0-16-generic root=UUID=e1bf9820-e70e-4e84-9037-621437cc90f1 ro radeon.audio=1
SourcePackage: xorg
Symptom: display
UpgradeStatus: Upgraded to artful on 2017-11-06 (2 days ago)
dmi.bios.date: 10/28/2011
dmi.bios.vendor: American Megatrends Inc.
dmi.bios.version: 4.6.4
dmi.board.name: AMD HUDSON-M1
dmi.board.vendor: ZOTAC
dmi.chassis.type: 3
dmi.modalias: dmi:bvnAmericanMegatrendsInc.:bvr4.6.4:bd10/28/2011:svn:pn:pvr:rvnZOTAC:rnAMDHUDSON-M1:rvr:cvn:ct3:cvr:
version.compiz: compiz 1:0.9.13.1+17.10.20170901-0ubuntu1
version.libdrm2: libdrm2 2.4.83-1
version.libgl1-mesa-dri: libgl1-mesa-dri 17.2.2-0ubuntu1
version.libgl1-mesa-glx: libgl1-mesa-glx 17.2.2-0ubuntu1
version.xserver-xorg-core: xserver-xorg-core 2:1.19.5-0ubuntu2
version.xserver-xorg-input-evdev: xserver-xorg-input-evdev 1:2.10.5-1ubuntu1
version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.10.0-1
version.xserver-xorg-video-intel: xserver-xorg-video-intel 2:2.99.917+git20170309-0ubuntu1
version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.15-2
xserver.bootTime: Wed Oct 18 20:39:16 2017
xserver.configfile: default
xserver.devices:
 input Power Button KEYBOARD, id 6
 input Power Button KEYBOARD, id 7
 input Riitek Micro Keyboard KEYBOARD, id 8
 input Riitek Micro Keyboard MOUSE, id 9
 input Riitek Micro Keyboard KEYBOARD, id 10
xserver.errors:

xserver.logfile: /var/log/Xorg.0.log
xserver.version: 2:1.19.3-1ubuntu1.3
xserver.video_driver: radeon