Comment 12 for bug 628144

Copy-Paste from https://bugs.launchpad.net/bugs/657976

"Hi everyone - I'm one of the devs that have spent extensive time chasing this slowness issue. I assure you I can relate to your disappointment over a sluggish system. It's buggering me a lot as well.

The problem is that on some systems Unity runs perfectly fast (for instance on my Eee 1001, intel 945GME, Atom N270, which is definitely *not* a high end netbook by today's standards - on the contrary :-)), while on other systems (also with much higher specs) it runs very slowly. This makes it pretty tricky to debug if you don't have the right hardware as you can imagine.

So; any thoughts, tinkering, playing around, or hardcore profiling you guys do are most appreciated! While I can see that there is a lot of general slowness - it would be most valuable to hear if *anything* runs fast? That could make it easier to narrow down the problem.

While you're at it, you might also want to try an run Unity with the environment variable CLUTTER_VBLANK=none set. This has reportedly fixed the issue for some. To test it out simply run 'CLUTTER_VBLANK=none mutter --replace' from a terminal. If it works for you, you can make it permanent by executing 'sudo echo "CLUTTER_VBLANK=none" >> /etc/X11/Xsession.d/10unity-quirks'.

Thanks for all the input so far!"