Having previously used Ubuntu 8.04 I later moved to Xubuntu 9.10 and
currently Lubuntu 11.10. So I'm not really familiar with how the Unity
experience has evolved over the past few releases. This comment is
mostly about my first impressions on booting the Ubuntu 12.10 x86 CD in
a VirtualBox VM.

The user experience is, to be frank, awful. It's almost unusably slow.

No accelerated graphics driver is loaded when the CD boots. The overall
GUI experience is dog-slow, and that's with a ~2GHz Core 2 Duo. I
imagine many potential users will try Ubuntu/Unity and be put off before
even installing it. Not to mention users of ARM systems which have
significantly slower CPUs and probably no accelerated graphics driver
available even after installing...

13.04 is supposed to have an emphasis on efficiency, so I hope something
can be done about the unaccelerated graphics experience by then.
Probably many systems are unaccelerated when booting the CD, even if an
accelerated driver might be available after installation. It gives a
very poor impression to potential users.

I recently read about Enlightenment, and how it's supposed to be very
efficient even with various "blingy" graphical effects. So I downloaded
an Ubuntu-based distribution which uses it, Bodhi Linux
(http://sourceforge.net/projects/bodhilinux/).

I booted the Bodhi CD in VirtualBox and selected the Compositing
profile. Once the desktop had loaded, there was a stark contrast between
the fluidity of the GUI vs Ubuntu/Unity. Try opening several windows and
Alt-Tabbing between them. Even with my system slowed to 800MHz that was
pretty smooth.

Is there any possibility for a future version of Unity to build on or
borrow ideas/code from Enlightenment? That could largely solve the
problem. (Apparently Enlightenment does use accelerated graphics when
available.)

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https://bugs.launchpad.net/bugs/1055936

Title:
  Unity is unusuably slow with fallback software rendering (LLVMpipe)

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