KVM/QEMU/VirtManager is a hypervisor and a good alternative to Virtualbox. Performance should be better using this combination since KVM is built into the Linux kernel itself. And it's not difficult to convert your existing Virtualbox VM's over to VirtManager.

SOME COMMANDS I USED IN THIS VIDEO:
LC_ALL=C lscpu | grep Virtualization
yay S qemu virtmanager ebtables
sudo systemctl enable libvirtd
sudo systemctl start libvirtd
sudo systemctl status libvirtd
sudo usermod G libvirt a dt
sudo qemuimg convert f vdi O qcow2 Ubuntu\ 20.04.vdi /var/lib/libvirt/images/ubuntu2004.qcow2

REFERENCED:
► https://wiki.archlinux.org/index.php/KVM KVM
► https://wiki.archlinux.org/index.php/... QEMU
► https://wiki.archlinux.org/index.php/... Libvirt
► https://virtmanager.org/ Virtmanager

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