I have run Squid on FreeBSD since FreeBSD 10.x (not sure of the exact minor version) and everything was working perfectly well. During all this years, I have regularly updated Squid and FreeBSD.
Currently I am using Squid 5.7 on FreeBSD 13.1-RELEASE-p5 but had the same problem with...
I got a KVM server from a hosting provider (i don't know if it's allowed to tell his name).
I have 2 x CPU cores and 2 GB RAM but with any version of FreeBSD [fresh installed] my CPU it's 100% and for example when I compile KERNEL, it's about ~70% used.
Any solution/idea ?