I’ve used quite some of these manuals before, most without succes cause after a few weeks they all seem to crash/freeze screen. Finally I have a setup that’s working:

• install raspian lite
• use this script to install MM: https://github.com/pureartisan/magic-mirror-raspbian-lite
• update npm with npm install -g electron --unsafe-perm=true --allow-root
• increase swap

sudo dphys-swapfile swapoff
sudo nano /etc/dphys-swapfile
CONF_SWAPSIZE=1024
sudo dphys-swapfile setup
sudo dphys-swapfile swapon
sudo reboot

• adjust /boot/config.txt with the following settings for overclock:

arm_freq=1085
gpu_freq=530
over_voltage=8
sdram_freq=500
over_voltage_sdram=1

• I also monitor the behaviour of the RPI’s performance in Home Assistant (in case it would crash, I have an indicator what went wrong) with: https://github.com/Sennevds/system_sensors

So far it -finally- works like a charm!