Increase RAM Capacity

Use a memory card as extended cache for RAM to avoid system lag when many services have to run at the same time in a short period.

Check the amount of RAM being used: $ htop or free --mega

Increase RAM Capacity

Disable the swap file:

sudo dphys-swapfile swapoff

sudo nano /etc/dphys-swapfile

Declare the Swapfile

SWAP_SIZE=1G && SWAP_FILE=/swapfile && sudo swapoff -a && sudo rm -rf $SWAP_FILE && sudo fallocate -l $SWAP_SIZE $SWAP_FILE && sudo chmod 600 $SWAP_FILE && sudo mkswap $SWAP_FILE && sudo swapon -a

Enable the swap file:

sudo dphys-swapfile swapon

Create a new swap file:

sudo dphys-swapfile setup