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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https://bugs.launchpad.net/bugs/1277598

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

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