This first error is not Atom-specific but also happens on a Haswell
i7-4770 desktop:

intel_miptree_blit: Can't use hardware blitter from MESA_FORMAT_R8G8B8A8_UNORM 
to MESA_FORMAT_A_UNORM8, falling back.
intelCopyTexSubImage - fallback to swrast

I'll move that one to a separate bug.

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https://bugs.launchpad.net/bugs/1580792

Title:
  Unity8 on Intel Atoms performs poorly

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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