Virtual machine for FreeBSD

Dear ALL

Could you please recommend me a virtual machine for FreeBSD?
I need to host some small project which will require a dedicated hardware for Linux.
Oracle Virtual Box, IMHO - quite slow and heavy.
The project doesn't require any GUI staff.

Thanks in advance
Does hypervisor works only on BSD - AMD64? In i386:
# kldload vmm
kldload: can't load vmm: No such file or directory
I'm not 100% sure, but I'd say, yes it requires a 64 bit CPU and OS.