Public bug reported:

I just upgraded my laptop to 15.10.  After the upgrade, chromium is very
sluggish.  It is unresponsive to the point of being unusable.

ProblemType: Bug
DistroRelease: Ubuntu 15.10
Package: chromium-browser 49.0.2623.87-0ubuntu0.15.10.1.1222
ProcVersionSignature: Ubuntu 4.2.0-34.39-generic 4.2.8-ckt4
Uname: Linux 4.2.0-34-generic x86_64
ApportVersion: 2.19.1-0ubuntu5
Architecture: amd64
CurrentDesktop: Unity
DRM.card0.DP.1:
 edid-base64: 
 dpms: Off
 modes: 
 enabled: disabled
 status: disconnected
DRM.card0.DP.2:
 edid-base64: 
 dpms: Off
 modes: 
 enabled: disabled
 status: disconnected
DRM.card0.HDMI.A.1:
 edid-base64: 
 dpms: Off
 modes: 
 enabled: disabled
 status: disconnected
DRM.card0.HDMI.A.2:
 edid-base64: 
 dpms: Off
 modes: 
 enabled: disabled
 status: disconnected
DRM.card0.eDP.1:
 edid-base64: 
AP///////wAGrz0SAAAAAAAYAQSVHxF4AuKVnllSmSYcUFQAAAABAQEBAQEBAQEBAQEBAQEBsDaAtHA4HkAwZDEANa0QAAAYAAAADwAAAAAAAAAAAAAAAAAgAAAA/gBBVU8KICAgICAgICAgAAAA/gBCMTQwSFROMDEuMiAKAII=
 dpms: On
 modes: 1920x1080
 enabled: enabled
 status: connected
Date: Thu Mar 24 11:35:23 2016
Desktop-Session:
 'ubuntu'
 '/etc/xdg/xdg-ubuntu:/usr/share/upstart/xdg:/etc/xdg'
 '/usr/share/ubuntu:/usr/share/gnome:/usr/local/share/:/usr/share/'
DetectedPlugins:
 
Env:
 'None'
 'None'
InstallationDate: Installed on 2015-08-18 (218 days ago)
InstallationMedia: Ubuntu 15.04 "Vivid Vervet" - Release amd64 (20150422)
Load-Avg-1min: 0.69
Load-Processes-Running-Percent:   0.1%
MachineType: LENOVO 20BS003BUS
ProcKernelCmdLine: BOOT_IMAGE=/boot/vmlinuz-4.2.0-34-generic 
root=UUID=b7935dc9-2ee9-4776-b8ba-55f007225779 ro quiet splash vt.handoff=7
SourcePackage: chromium-browser
UdevLog: Error: [Errno 2] No such file or directory: '/var/log/udev'
UpgradeStatus: Upgraded to wily on 2016-03-23 (0 days ago)
dmi.bios.date: 03/12/2015
dmi.bios.vendor: LENOVO
dmi.bios.version: N14ET28W (1.06 )
dmi.board.asset.tag: Not Available
dmi.board.name: 20BS003BUS
dmi.board.vendor: LENOVO
dmi.board.version: SDK0E50510 WIN
dmi.chassis.asset.tag: No Asset Information
dmi.chassis.type: 10
dmi.chassis.vendor: LENOVO
dmi.chassis.version: None
dmi.modalias: 
dmi:bvnLENOVO:bvrN14ET28W(1.06):bd03/12/2015:svnLENOVO:pn20BS003BUS:pvrThinkPadX1Carbon3rd:rvnLENOVO:rn20BS003BUS:rvrSDK0E50510WIN:cvnLENOVO:ct10:cvrNone:
dmi.product.name: 20BS003BUS
dmi.product.version: ThinkPad X1 Carbon 3rd
dmi.sys.vendor: LENOVO
gconf-keys: /desktop/gnome/applications/browser/exec = 
b'/usr/bin/chromium-browser\n'/desktop/gnome/url-handlers/https/command = 
b'/usr/bin/chromium-browser %s\n'/desktop/gnome/url-handlers/https/enabled = 
b'true\n'/desktop/gnome/url-handlers/http/command = b'/usr/bin/chromium-browser 
%s\n'/desktop/gnome/url-handlers/http/enabled = 
b'true\n'/desktop/gnome/session/required_components/windowmanager = 
b''/apps/metacity/general/compositing_manager = 
b''/desktop/gnome/interface/icon_theme = 
b'gnome\n'/desktop/gnome/interface/gtk_theme = b'Clearlooks\n'
modified.conffile..etc.default.chromium.browser: [deleted]

** Affects: chromium-browser (Ubuntu)
     Importance: Undecided
         Status: New


** Tags: amd64 apport-bug wily

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https://bugs.launchpad.net/bugs/1561591

Title:
  Chromium incredibly sluggish in 15.10

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