I've just ran sudo pacman -Syyu and after running my shell became unresponsive. I was able to do a clean reboot and was unable to access ssh. I did a clean shutdown and reboot and got into ssh but system is slow. It seems to be a bit better now but still not running as responsively as usual. Could one of the package updates be the cause. I updated fontconfig, mesa and mesa.libgl.
tail -11 /var/log/pacman.log
$this->bbcode_second_pass_code('', '[2016-08-07 12:10] [PACMAN] Running 'pacman -Syyu'
[2016-08-07 12:10] [PACMAN] synchronizing package lists
[2016-08-07 12:10] [PACMAN] starting full system upgrade
[2016-08-07 12:10] [ALPM] transaction started
[2016-08-07 12:10] [ALPM] upgraded fontconfig (2.12.1-1 -> 2.12.1-3)
[2016-08-07 12:10] [ALPM-SCRIPTLET] updating font cache... done.
[2016-08-07 12:10] [ALPM] upgraded mesa (12.0.1-5 -> 12.0.1-7)
[2016-08-07 12:10] [ALPM] upgraded mesa-libgl (12.0.1-5 -> 12.0.1-7)
[2016-08-07 12:10] [ALPM] transaction completed
[2016-08-07 12:10] [ALPM] running 'man-db.hook'...
[2016-08-07 12:11] [PACMAN] Running 'pacman -Rns'')