I tried ubuntu-gnome live, looks fine on my BDW with 3200x1800 screen..

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  modesetting driver unbearably slow on intel graphics

Status in xorg-server package in Ubuntu:

Bug description:
  After upgrading to Yakkey, I found the graphics performance of my
  MacBookPro12,1 (13", 2015, retina/hidpi display) became unbearably
  slow - switching workspaces, playing games, even just scrolling web
  browser tabs was visibly slower. The computer became constantly warm,
  and battery life dropped.

  Switching from using from modesetting back to the intel driver fixed
  these problems.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: xserver-xorg-core 2:1.18.4-1ubuntu6
  ProcVersionSignature: Ubuntu 4.8.0-21.23-generic 4.8.0
  Uname: Linux 4.8.0-21-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
  CompizPlugins: No value set for 
  CompositorRunning: None
  CurrentDesktop: GNOME
  Date: Tue Oct 11 11:47:47 2016
  DistUpgraded: 2016-10-05 14:48:30,702 ERROR got error from PostInstallScript 
./xorg_fix_proprietary.py (g-exec-error-quark: Failed to execute child process 
"./xorg_fix_proprietary.py" (No such file or directory) (8))
  DistroCodename: yakkety
  DistroVariant: ubuntu
  ExtraDebuggingInterest: Yes, including running git bisection searches
   Intel Corporation Iris Graphics 6100 [8086:162b] (rev 09) (prog-if 00 [VGA 
     Subsystem: Apple Inc. Iris Graphics 6100 [106b:013f]
  InstallationDate: Installed on 2015-07-22 (446 days ago)
  InstallationMedia: Ubuntu-GNOME 15.04 "Vivid Vervet" - Release amd64 
   Bus 002 Device 001: ID 1d6b:0003 Linux Foundation 3.0 root hub
   Bus 001 Device 003: ID 05ac:0273 Apple, Inc. 
   Bus 001 Device 002: ID 05ac:8290 Apple, Inc. 
   Bus 001 Device 001: ID 1d6b:0002 Linux Foundation 2.0 root hub
  MachineType: Apple Inc. MacBookPro12,1
  ProcKernelCmdLine: BOOT_IMAGE=/vmlinuz-4.8.0-21-generic 
root=/dev/mapper/ubuntu--gnome--vg-root ro quiet splash acpi_backlight=vendor 
i915.fastboot=1 vt.handoff=7
  SourcePackage: xorg-server
  UpgradeStatus: Upgraded to yakkety on 2016-10-05 (5 days ago)
  dmi.bios.date: 09/28/2015
  dmi.bios.vendor: Apple Inc.
  dmi.bios.version: MBP121.88Z.0167.B14.1509281135
  dmi.board.name: Mac-E43C1C25D4880AD6
  dmi.board.vendor: Apple Inc.
  dmi.board.version: MacBookPro12,1
  dmi.chassis.type: 9
  dmi.chassis.vendor: Apple Inc.
  dmi.chassis.version: Mac-E43C1C25D4880AD6
  dmi.product.name: MacBookPro12,1
  dmi.product.version: 1.0
  dmi.sys.vendor: Apple Inc.
  version.compiz: compiz N/A
  version.ia32-libs: ia32-libs N/A
  version.libdrm2: libdrm2 2.4.70-1
  version.libgl1-mesa-dri: libgl1-mesa-dri 12.0.3-1ubuntu2
  version.libgl1-mesa-dri-experimental: libgl1-mesa-dri-experimental N/A
  version.libgl1-mesa-glx: libgl1-mesa-glx 12.0.3-1ubuntu2
  version.xserver-xorg-core: xserver-xorg-core 2:1.18.4-1ubuntu6
  version.xserver-xorg-input-evdev: xserver-xorg-input-evdev N/A
  version.xserver-xorg-video-ati: xserver-xorg-video-ati 1:7.7.1-1
  version.xserver-xorg-video-intel: xserver-xorg-video-intel 
  version.xserver-xorg-video-nouveau: xserver-xorg-video-nouveau 1:1.0.12-2

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