Hi,
I don't think it's fair to say that free software could not preform as fast
as proprietary software. From my experience, there is no overall performance
advantage between free or proprietary software.
The reason why glxgears is maxing-out your CPU usage is because glxgears is a
performance test and this is what it is supposed to do.
Glxgears is using your CPU instead of your GPU because your system is unable
to utilize 3D graphics acceleration. This is also why the desktop effects
aren't working.
As far as I know, there really aren't any truly free Radeon drivers that come
with 3D acceleration. The drivers considered free by Ubuntu and some other
non-free GNU/Linux distributions, contain some binary blob firmware for which
there is no source code disclosed.
According to an AMD's employee words, they do not want to disclose the source
code for this binary, because that would make their DRM (Digital Restriction
Management) implementation easier to deal with.
You can read a discussion between this AMD employee and a user asking about
the binary blob here (from post #627 till #638):
http://phoronix.com/forums/showthread.php?t=6585&page=63#627
I do not know why Youtube's Flash videos consume so much resources. I guess
it is due to the reverse engineering needed to develop a free Flash player.
There are various browser plugins that will enable you to download or watch
directly non-flash versions of Youtube videos — this will clear any
performance issues.
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