Ya from my research raspberry pi is powerful enough to act as a DNS server for a home. I probs wouldn’t put a 4k plex library on it but it should do the job.

In my case however I’m not running a raspberry pi. I have installed PiOS into Windows using WSL (like a lunatic) in an effort to not reformat my whole server computer and install something more practical (like Ubuntu server).

Clue in name.

I give my pihole container about 1GB of RAM and one core and it's good to go (two cores helps with maintenance tasks though.) An entire RPi just to run pihole is such overkill.

It's not that much of a strain since it only handles DNS traffic.

When you go to e.g. programming.dev, you computer needs to know the actual IP and not just domain name so it asks a DNS server and recieves an answer like 172.67.137.159 for example. The pihole will just route the traffic to a real DNS server if it's a normal website or give a unkown ip kind of answer if it's a blacklisted domain. Actually transmitting the website which is the bulk of trafic is handled without the piholes involvement.

I had reliability issues with PiHole and moved to AdGuardHome a couple of years ago. It has never, ever crashed and the updates takes a couple of seconds. It rocks.