Slow performance issues of OpenBSD or FreeBSD KVM guest on Linux

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I run a couple of OpenBSD and FreeBSD guest/virtual machines under KVM. My server has 32GB ram and 4C/8T Intel Xeon CPU. Everything was working fine until recent CentOS Linux 7 kernel update. After a fresh reboot of my CentOS 7 Linux box OpenBSD and FreeBSD machine become very slow and after 24 hours stop responding to the network request. How can I solve significant performance problems with BSD family of oses running on CentOS 7 KVM?