Setting fiat to false did the trick. It’s still eating cpu during updating unconfirmed tx, but by far not that aggressive anymore. 

  "FIAT_PRICE": {
    "ENABLED": false,
    "PAID": false,
    "API_KEY": "your-api-key-from-freecurrencyapi.com"
  }

will not checkout an API key and set it to true again 

 good looks, did make that change but don't remember it causing high resource usage...just wanted to get rid of the log messages 😁 

 Kept it running with fiat enabled and a provided API key, but still, that was more cpu hungry than fiat disabled. So I will keep it like this for the sake of my cpu fans ;) for the time being