Followed this guide https://raspibolt.org/guide/bonus/bitcoin/mempool.html#requirements

No docker. I did not try to run it directly with core. I have 8GB ram on my machine, 13GB swap and 10GB zrm swap 

strange part is that the mempool service is behaving normal when restarting it, but in about a day I have again sooo much CPU resources eaten up by it that my fans are running crazy