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[arwi <1311735@xxxxxxxxxxxxxxxxxx>]

Had the same error on my Thinkpad with trusty on it. CPU usage was up to 100% when running vino-server. I checked strace and saw a lot of event polling. 
Turned off my wifi connection completely by the switch on the right side of the device. Plugged in the ethernet cable. Restarted vino-server... and, well, vino-server runs smootly as it should.

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https://bugs.launchpad.net/bugs/1311735

Title:
  vino-server using a lot of CPU and very sluggish after upgrade to
  14.04

Status in vino package in Ubuntu:
  Confirmed

Bug description:
  The title says its all.

   PID USER      PR  NI    VIRT    RES    SHR S  %CPU %MEM     TIME+ COMMAND  
   8150 romano    20   0   64268   8800   5948 R  57.8  0.4 126:57.46 vino-se+ 
   8883 romano    20   0  632412  34788   6156 S  31.8  1.7 195:15.26 dropbox  
   1420 root      20   0    9964   1940    940 S   8.5  0.1  36:28.15 cups-br+

  It was working nicely in 13.10; now it feels very sluggish and the CPU usage is very high all the time. 
  Connecting with TigerVNC from a Windows machine, but a couple of fast test showed the same problem with other clients.

  ProblemType: Bug
  DistroRelease: Ubuntu 14.04
  Package: vino 3.8.1-0ubuntu1
  ProcVersionSignature: Ubuntu 3.13.0-24.46-generic 3.13.9
  Uname: Linux 3.13.0-24-generic i686
  ApportVersion: 2.14.1-0ubuntu3
  Architecture: i386
  CurrentDesktop: XFCE
  Date: Wed Apr 23 09:17:05 2014
  InstallationDate: Installed on 2013-04-30 (358 days ago)
  InstallationMedia: Ubuntu 13.04 "Raring Ringtail" - Release i386 (20130424)
  SourcePackage: vino
  UpgradeStatus: Upgraded to trusty on 2014-04-21 (1 days ago)

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