Enable Numlock on start
Reduce SSD writes
Remove Asian fonts
Remove Java
Faster updates for Firefox
Clear the thumbnail cache
Remove microphone background noise
How to improve sound quality in Linux
How to change the soundcards default sample rate
Make menu bar in Firefox visible
Puting the Firefox network cache into the RAM
Enable video hardware acceleration in Firefox
Disabling sessionstore in Firefox
Optimize the Places database from time to time
Optimize LibreOffice
How to change DNS address in Linux
Open a port in your firewall
How to change Swappiness
How to reduce a video file size with ffmpeg
How to debloat Debian by not using 'recommended packages'
How to delete old unused kernels
Make XFCE faster, change window manager
Make Favorite folders in XFCE panel
To get the installed date in Neofetch
Make Lightdm remember username when log in
Install apt-listbugs
Disable wpa_supplicant
If you don't use wifi connection, you can disable wpa_supplicant.

Disable NetworkManager's use of wpa_supplicant to manage wifi clients:

[code]nmcli radio wifi off[\code]

After this, NetworkManager won't try to manage wifi devices as clients. Now you can just disable/stop the wpa_supplicant service without worrying that it will start automatically:

[code]systemctl disable wpa_supplicant[\code] [code]systemctl stop wpa_supplicant[\code]

Note that NM might still be managing an active network interface for a wifi connection. To kill this, just do nmcli c to view the interfaces, and then:

[code]nmcli c d wlan0[\code]

… for a wifi interface named wlan0.