$ uname -a                                              :(
Linux localvm 4.4.31-1-lts #1 SMP Thu Nov 10 18:01:16 CET 2016 x86_64 GNU/Linux

$ time LC_ALL=C sudo pacman -Su
:: Starting full system upgrade...
resolving dependencies...
looking for conflicting packages...

Packages (2) linux-lts-4.4.34-1  linux-lts-headers-4.4.34-1

Total Installed Size:  124.43 MiB
Net Upgrade Size:        0.00 MiB

:: Proceed with installation? [Y/n]
(2/2) checking keys in keyring                     [######################] 100%
(2/2) checking package integrity                   [######################] 100%
(2/2) loading package files                        [######################] 100%
(2/2) checking for file conflicts                  [######################] 100%
(2/2) checking available disk space                [######################] 100%
:: Running pre-transaction hooks...
(1/1) Remove DKMS modules
==> dkms remove vboxguest/5.1.10_OSE -k 4.4.31-1-lts
:: Processing package changes...
(1/2) upgrading linux-lts                          [######################] 100%
>>> Updating module dependencies. Please wait ...
>>> Generating initial ramdisk, using mkinitcpio.  Please wait...
==> Building image from preset: /etc/mkinitcpio.d/linux-lts.preset: 'default'
  -> -k /boot/vmlinuz-linux-lts -c /etc/mkinitcpio.conf -g /boot/initramfs-linux-lts.img
==> Starting build: 4.4.34-1-lts
  -> Running build hook: [systemd]
  -> Running build hook: [autodetect]
  -> Running build hook: [modconf]
  -> Running build hook: [block]
  -> Running build hook: [filesystems]
  -> Running build hook: [fsck]
==> Generating module dependencies
==> Creating gzip-compressed initcpio image: /boot/initramfs-linux-lts.img
==> Image generation successful
(2/2) upgrading linux-lts-headers                  [######################] 100%
:: Running post-transaction hooks...
(1/1) Install DKMS modules
==> dkms install vboxguest/5.1.10_OSE -k 4.4.34-1-lts
LC_ALL=C sudo pacman -Su  36,45s user 2,89s system 131% cpu 29,873 total