High CPU usage with influxdb

I running an influx db 1.8.5 version in docker on a raspberry pi 4. I use it to store several sensor measurements with it. However, I don’t understand and I can’t find the issue why it consumes around 50-70% CPU time on all my cores, which means a total of 70-100% usage. (without influx running it’s around 10-30%). The same data is saved in MySQL, but that doesn’t have such an issue (at least with saving).
Can somebody help me to find the issue as I’m not familiar with this database?

As I can’t upload here files, I’ve uploaded here the profile and the vars: https://we.tl/t-A2GOpkxZRX .