dietpi@solo:~$ free -m
total used free shared buff/cache available
Mem: 223 54 18 11 170 169
Swap: 767 10 757
I also have a RPi3 with Pihole, Unbound, and Tailscale... for Tailscale: dietpi@cubano:~$ free -m
total used free shared buff/cache available
Mem: 956 233 473 24 289 722
Swap: 1088 0 1088
Still plenty of space in 1GB of ram, and OpenWRT is probably a bit more compact than DietPi.