Optimization

Disable Desktop Booting

raspi-config > 1 System Options > S5 Boot / Auto Login

Limit GPU Memeory to 16B

 raspi-config > 4 Performance Options >  P2 GPU Memory

Disable HDMI

Edit /etc/rc.local

/usr/bin/tvservice -o
exit 0

Disable Bluetooth

sudo systemctl disable hciuart
systemctl disable bluetooth.service

Edit /boot/config.txt

dtoverlay=disable-bt

Disable Onboard LED

Edit /boot/config.txt

dtparam=pwr_led_trigger=none
dtparam=pwr_led_activelow=off

dtparam=act_led_trigger=none
dtparam=act_led_activelow=off