Same here, downgrading to 4.4 from Xenial improved the situation (boot
still feels a little slower than Xenial though, maybe because of the
NetworkManager bug). I use a 7 years old desktop computer based on a
Gigabyte motherboard and AMD Phenom II X4 955 CPU, So it's not Thinkpad-

(From GRUB to lightdm used to be 7 seconds in 16.04, but using Kernel
4.8 and the new network manager it feels more like 20 secs. Also, the
Unity 7+Chromium launch used to take just very few seconds, now it's a
noticable delay with only the wallpaper showing, no matter which kernel
I use, so that's unrelated. Anyway, booting my computer has just become
a lot less fun even though I removed Apache 2 and Tomcat. :( )

You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux in Ubuntu.

  [4.8 regression] boot has become very slow

Status in linux package in Ubuntu:

Bug description:
  With yakkety's recent update from linux 4.4 to 4.8 booting has become
  a lot slower. It's not one service in particular, but without "quiet"
  and "splash" you can now easily read every single line instead of that
  whole wall of text zipping by. It now takes over 20s instead of ~10
  seconds to boot.

  This is even more dramatic when factoring out the recent boot hang of
  NetworkManager (bug 1622893) and disabling lightdm:

    sudo systemctl mask NetworkManager NetworkManager-wait-online

  then booting with 4.4 takes 1.5s and with 4.8 19.5s (!).

  Some excerps from systemd-analyze blame:

             474ms postfix@-.service
             395ms lxd-containers.service
             305ms networking.service

            4.578s postfix@-.service
            7.300s lxd-containers.service
            6.285s networking.service

  I attach the full outputs of critical-chain and analyze for 4.4 and
  4.8 for reference.

  This is much less noticeable in the running system. There is no immediate 
feeling of sluggishness (although my system is by and large idle).

  I compared the time of sbuilding colord under similar circumstances
  (-j4, building on tmpfs, thus no hard disk delays; running with fully
  pre-loaded apt-cacher-ng thus no random network delays), and with 4.4
  it takes 6.5 minutes and with 4.8 it takes 7.5. So that got a bit
  slower, but much less dramatically than during boot, so this is either
  happening when a lot of processes run in parallel, or is perhaps
  related to setting up cgroups.

  One thing I noticed that during sbuild in 4.8 "top" shows ridiculous
  loads (~ 250) under 4.8, while it's around 4 or 5 under 4.8. But that
  doesn't reflect in actual sluggishness, so this might be just an
  unrelated bug.

  ProblemType: Bug
  DistroRelease: Ubuntu 16.10
  Package: linux-image-4.8.0-11-generic 4.8.0-11.12
  ProcVersionSignature: Ubuntu 4.8.0-11.12-generic 4.8.0-rc6
  Uname: Linux 4.8.0-11-generic x86_64
  ApportVersion: 2.20.3-0ubuntu7
  Architecture: amd64
   /dev/snd/pcmC0D0c:   martin     3049 F...m pulseaudio
   /dev/snd/pcmC0D0p:   martin     3049 F...m pulseaudio
   /dev/snd/controlC0:  martin     3049 F.... pulseaudio
  Date: Thu Sep 22 09:42:56 2016
  EcryptfsInUse: Yes
  MachineType: LENOVO 2324CTO
   PATH=(custom, no user)
  ProcFB: 0 inteldrmfb
  ProcKernelCmdLine: BOOT_IMAGE=/@/boot/vmlinuz-4.8.0-11-generic.efi.signed 
root=UUID=f86539b0-3a1b-4372-83b0-acdd029ade68 ro rootflags=subvol=@ 
   linux-restricted-modules-4.8.0-11-generic N/A
   linux-backports-modules-4.8.0-11-generic  N/A
   linux-firmware                            1.161
  SourcePackage: linux
  UpgradeStatus: No upgrade log present (probably fresh install) 07/09/2013
  dmi.bios.vendor: LENOVO
  dmi.bios.version: G2ET95WW (2.55 )
  dmi.board.asset.tag: Not Available 2324CTO
  dmi.board.vendor: LENOVO
  dmi.board.version: 0B98401 Pro
  dmi.chassis.asset.tag: No Asset Information
  dmi.chassis.type: 10
  dmi.chassis.vendor: LENOVO
  dmi.chassis.version: Not Available
dmi:bvnLENOVO:bvrG2ET95WW(2.55):bd07/09/2013:svnLENOVO:pn2324CTO:pvrThinkPadX230:rvnLENOVO:rn2324CTO:rvr0B98401Pro:cvnLENOVO:ct10:cvrNotAvailable: 2324CTO
  dmi.product.version: ThinkPad X230
  dmi.sys.vendor: LENOVO

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