[SUPPORT] High CPU usage after migrate an existing bbolt database to PostgreSQL

This may be normal, I did the migration from bbolt to PostgreSQL all went well. But now I see a higher CPU usage observing htop. It's not all of the time but it comes in waves. I see average load usually at 0.20-0.40 then it spikes to around 4.00 for around 15 minutes every few hours. Is the PostgreSQL really recommended for a rpi? rpi4 in my case

After doing some research I came to this guide about how to tweak postgreSQL memory in order for it to use less CPU: https://www.enterprisedb.com/postgres-tutorials/how-tune-postgresql-memory
It worked and I set up my values under /etc/posgresql/18/main/posgresqp.conf to:

shared_buffers = 2048MB
work_mem = 40MB
maintenance_work_mem = 400MB

So it would be nice to add this to the ramix guide, so others don't have high usage of their rpi's CPU as well. If you have more experience with it and would like to improve those tweaks it would be very appreciated too.