I also have this issue. Since the ondemand up_threshold is set default
at 80, browsing is somewhat less responsive compared to using
performance governor. I fixed this by modifying the /etc/init.d/ondemand
to set the up_threshold to 20. However, this is not a permanent fix.
When I switch power profiles, up_threshold value goes back to 80 when I
revert to ondemand governor. Is the 80 value built into the kernel or is
there a conf file we can modify to change this value permanently?

I noticed that a lot of users have different preferences with regards to
the up_threshold value. Some would want the value up high and some like
me want the value low. Would it be possible to have a conf file which
contains the up_threshold value and could be modified by users according
to their preferences? I think this would be helpful to all.

Karmic System
AMD Turion TL-64 (2.2GHz)
4GB Ram

>uname -a
Linux dv2845se 2.6.31-16-generic-pae #53-Ubuntu SMP Tue Dec 8 05:20:21 UTC 2009 
i686 GNU/Linux

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ondemand cpufreq governor reacts too slowly
https://bugs.launchpad.net/bugs/326149
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