I was looking to post a bug report about the ondemand governor, but this one 
looks similar enough [see what you guys think, I'll open a new report if it's 
too different].
My problem is similar, except it's not that the governor reacts too slowly, 
more that it doesn't give enough Hz when doing something which clearly benefits 
when the speed is set higher. I can start watching a HQ youtube video while 
it's set to ondemand and the gov stays at the lowest level, the video will 
appear a little slow and stuttery at this point. I can then set it to 
performance mode, and the video is perfectly fine. If I then set it to ondemand 
again while the video is still running, the level switches to 2nd from lowest 
instead! And that level works fine too. If only the ondemand governor would 
switch up automatically to whatever level is needed!

This isn't the same as the bug I've seen where the governor won't change
at all though, if a process comes along that clearly uses alot of cpu,
then the ondemand gov kicks it up to full.

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