A 'mere' VPN gateway stacked with LuCI, WG, PBR, DOH, SSH, SFTP, htop idles @ < 64 MB RAM, < 12 MB storage before any proprietary, third party trash like QSDK/MTSDK or GUI flash.
root@null:~# df -h && grep -m '1' 'PRETTY_NAME' /etc/os-release && uname -a && now
Filesystem Size Used Available Use% Mounted on
/dev/root 2.8M 2.8M 0 100% /rom
tmpfs 122.2M 1.4M 120.8M 1% /tmp
/dev/ubi0_1 212.5M 11.7M 196.0M 6% /overlay
overlayfs:/overlay 212.5M 11.7M 196.0M 6% /
tmpfs 512.0K 0 512.0K 0% /dev
PRETTY_NAME="OpenWrt 23.05.5"
Linux null 5.15.167 #0 SMP Mon Sep 23 12:34:46 2024 mips GNU/Linux
20250821T153609UTC