KVM: Virtual Bridge (virbr0) is NOT needed! I show you how to remove it :)

for KVM, using an actual network bridge is desired for performance over NAT. There is a virtual bridge used by XEN (virbr0) that you won’t need.
To disable it:

virsh net-destroy default
virsh net-undefine default

If Redhat based distro:

service libvirt-bin stop

If Debian/Ubuntu based distro:

service libvirtd restart
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