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[TxSx <ts-p42245@xxxxxxxxxx>]

I don't think wireless is the problem here. Based on a tip from another thread I did a live-CD test 
using xubuntu-12.10-desktop-i386.iso (kernel Linux xubuntu 3.5.0-17-generic #28-Ubuntu SMP Tue 
Oct 9 19:32:08 UTC 2012 i686 i686 i686 GNU/Linux). Playing fullscreen video with 
Firefox (installed Adobe flash player 11,2,202,341) syslog stays nice and quiet. I also updated
flash to current configuration but it made no difference. I am adding lspci from Xubuntu.
When doing rough comparison on system monitors it seems the CPU load is much less on Xubuntu.
The 2nd core seems to have very little load. Current configuration has much higher CPU load and 
the 2nd core has the same high load as the 1st one.

Is there anything I could search from Xubuntu to see what makes the
difference?

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Packages, which is subscribed to linux in Ubuntu.
https://bugs.launchpad.net/bugs/1277598

Title:
  8086:4227 [Lenovo ThinkPad T60] WLAN connection break under load
  (iwl3945)

Status in “linux” package in Ubuntu:
  Incomplete

Bug description:
  How to reproduce: Watch a YouTube with Opera full screen, then jump
  back and forth in the video and observe connection break.

  Tried with kernels:
  3.13.1-031301.201401291035
  3.8.0-35.50~precise1
  3.8.0.35.35
  Attachment is from the latest kernel.

  WORKAROUND: Don't watch Flash videos.

  ---
  ApportVersion: 2.13.2-0ubuntu5
  Architecture: i386
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC0:  ubuntu     2047 F.... pulseaudio
   /dev/snd/pcmC0D0p:   ubuntu     2047 F...m pulseaudio
  CasperVersion: 1.337
  DistroRelease: Ubuntu 14.04
  LiveMediaBuild: Ubuntu 14.04 LTS "Trusty Tahr" - Alpha i386 (20140224)
  MachineType: LENOVO 2008YZE
  Package: linux (not installed)
  PccardctlIdent:
   Socket 0:
     no product info available
  PccardctlStatus:
   Socket 0:
     no card
  ProcEnviron:
   TERM=xterm
   PATH=(custom, no user)
   LANG=en_US.UTF-8
   SHELL=/bin/bash
  ProcFB: 0 radeondrmfb
  ProcKernelCmdLine: file=/cdrom/preseed/hostname.seed boot=casper initrd=/casper/initrd.lz quiet splash -- maybe-ubiquity
  ProcVersionSignature: Ubuntu 3.13.0-11.31-generic 3.13.3
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  RelatedPackageVersions:
   linux-restricted-modules-3.13.0-11-generic N/A
   linux-backports-modules-3.13.0-11-generic  N/A
   linux-firmware                             1.125
  RfKill:
   0: phy0: Wireless LAN
    Soft blocked: no
    Hard blocked: no
  Tags:  trusty
  Uname: Linux 3.13.0-11-generic i686
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:

  _MarkForUpload: True
  dmi.bios.date: 09/19/2007
  dmi.bios.vendor: LENOVO
  dmi.bios.version: 79ETD9WW (2.19 )
  dmi.board.name: 2008YZE
  dmi.board.vendor: LENOVO
  dmi.board.version: Not Available
  dmi.chassis.asset.tag: L3PN735
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
  dmi.modalias: dmi:bvnLENOVO:bvr79ETD9WW(2.19):bd09/19/2007:svnLENOVO:pn2008YZE:pvrThinkPadT60:rvnLENOVO:rn2008YZE:rvrNotAvailable:cvnLENOVO:ct10:cvrNotAvailable:
  dmi.product.name: 2008YZE
  dmi.product.version: ThinkPad T60
  dmi.sys.vendor: LENOVO

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