Use a private bridge or NAT to prevent the VM from scanning your local network.
Use virtio-gpu or QXL drivers to reduce lag in the Windows UI.
The Ultimate Guide to Using Windows 7 QC0W2 Images in Virtual Environments windows 7qcow2
Since Windows 7 doesn't include these drivers natively, you must download the virtio-win ISO and load it during the "Select Disk" phase of the Windows installation. Security Considerations
Supports internal compression to save host disk space. Use a private bridge or NAT to prevent
Easily save the state of your Windows 7 VM and roll back if an update or app breaks it.
qemu-img convert -f vmdk -O qcow2 windows7.vmdk windows7.qcow2 Use code with caution. Common Troubleshooting windows 7qcow2
qemu-system-x86_64 -m 2G -enable-kvm -drive file=windows7.qcow2,format=qcow2 -cdrom win7_install.iso -boot d Use code with caution. Optimizing Performance with VirtIO