- Installed TLP-UI
Increase battery life with TLPUI
Enabled CPU Scaling and CPU Turbo Boost
Disabled USB Auto-Suspend
-- reboot --
Time to fiddle with the Wifi to see if I can get it back to what I had before:
Details > Make available to other users unchecked
Identity > SSID, BSSID, MAC Address, Cloned Address fields filled
IPv6 > Disabled
Ok, apparently WiFi doesn't like using a random cloned MAC address... which is weird, since I used to change the MAC address under Windows once a day, and it worked fine under Zorin OS before.