Another problem seems to be that it's even slower than the previous version which was already much slower than one of the first ones. I wonder if this will ever improve or if I will need to find a different software.
I was looking at the logs and saw that kbinbot has been hitting the server from 3 IP addresses like 10 times a second. I'm convinced this is a bug and not normal, so for now I have blocked those 3 IP addresses via nginx: