Fedora 28 shutdown really slow , Help !

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Here are the usual culprits, check each of them. You will be able to find what is going wrong:

1. Daemons with expensive shut-down sequences. Are you running any database in local for development?
2. Virtualization software with active guests. The guests first need to be suspended/shut down.
3. Running containers. Are you running Docker containers with expensive shut-down sequences (like 1)?
4. Network mounts which hang.
5. Some file indexing services (such as KDE's Baloo, GNOME Tracker)
6. Your WiFi or Bluetooth device which needs a shutdown sequence.
7. Slow, bog standard disk drive.

Reading the last boot log from journalctl with journalctl -b -0 will contain lines that identify what process is taking too much time to shut down.

There are many factors but it also depends on what state of drive you are using , is it SSD , or mechanical hard drive

The boot / Shutdown time depends on several parameters:

    1. The HW of your computer
    2. CPU
    3. Disk (SSD?)
    4. RAM
    5. The software installed on your computer.
    6. Old kernel 
    7. Environment parameters , DE , search paths etc
    8. GRUB features
    9. Priority ( priority of a program )
    10. CPU resources , Memory Resources , I/O resources ( I/O resources like Network , disk etc )
    11. Scheduling processes ( idle , sleep etc )
    12. Cron

Below two minutes time ( shown when you run systemd-analyze or systemd-analyze blame ) is normal

try to run command

sudo systemd-analyze blame

it will show you the culprit in your system if you are facing really slow ( if it is because of applications )

thanks

( firewall services, server app services , userspace etc takes more time, try to clean tmp , cache files etc time to time , use stracer for system optimization and look for service which consumes more time during start/turn off using SYSTEMD-ANALYZE BLAME)

( note : generally SSD drives speed up the process compared to mechanical hard drive )