I don't know if this is useful, but on my netbook the worst performance comes 
from black and transparent overlays, like when the Terminal asks for a password 
or when you want to turn off your computer. In those cases the frame time is 
more than 1s, sometimes 2s. I have to hard reboot every time because I can't 
click :(

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Touch seeded packages, which is subscribed to unity8 in Ubuntu.

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

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

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 

  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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