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The Unity Dash and HUD are slow to open, sometimes freezing the system for up to four seconds when I first hit the Alt or Super keys. Is there a simple way to find out where the time is going?

The folks in #ubuntu-unity advised that I could run valgrind --tool=callgrind compiz --replace to generate a profile of the application, however I want a simpler place from which to start troubleshooting.

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1st try clearing off the record history in System Settings --> Privacy. If that doesnot do the trick try disabling the RECORD ACTIVITY at the bottom. I think it might be due to Zeitgeist Datahub – Arin Chakraborty Dec 20 '12 at 19:00
let me know if that works! – Arin Chakraborty Dec 20 '12 at 19:01
Try this:… – Whitellama Dec 22 '12 at 17:51
This question has been answered several times – Dan Dascalescu Dec 30 '12 at 12:34

For me, the HUD was extremely slow when fading in and out. I solved it by installing Compiz Config and doing the following:

  1. Disabling Animations and Fading Windows
  2. Under Ubuntu Unity Plugin, setting the "Dash Blur" to "No Blur"
  3. Under Open GL, changing the texture filter to "Fast" and unchecked Framebuffer object.
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