@Guillame:
that is interesting, it might be useful to see if that happens for all dialogs 
like that (there should be a few in system settings app). If it does, it's 
probably worth reporting a bug against ubuntu-ui-toolkit to investigate that

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Touch seeded packages, which is subscribed to unity8 in Ubuntu.
https://bugs.launchpad.net/bugs/1580792

Title:
  Unity8 on Intel Atoms performs poorly (falls back to software
  rendering more than non-Atoms do)

Status in Canonical System Image:
  New
Status in unity8 package in Ubuntu:
  Confirmed

Bug description:
  (problem forked from bug 1549455)

  Unity8 on Intel Pineview performs very poorly. Frame times appears to
  be up to 900ms, Qt's renderer thread using 100% CPU.

  Running unity8 with MESA_DEBUG=1 EGL_LOG_LEVEL=debug reveals a few MESA 
errors:
  http://paste.ubuntu.com/16344427/

  Quoting @vanvugt "Those Mesa errors "Mesa: User error:" all look like
  OpenGL features that Unity8 is hitting but mir-demos don't. So those
  gl calls are also good candidates for explaining poor performance,
  especially if Mesa is falling back to software rendering for them."

  Since Qt tends to perform just fine on that hardware in X11, something
  isn't right.

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