If you absolutely cannot build your own, look for sources:
The guest OS lacks the VirtIO storage driver. Change the disk bus type back to SATA or IDE in Virt-Manager, boot into Windows, install the VirtIO guest tools, shut down, and switch the disk bus back to VirtIO .
Use VirtIO-GPU or Standard VGA during initial setup. Optimizing Windows 11 QCOW2 Performance
For maximum compatibility, security, and performance, creating your own image from official sources is the gold standard.
Alternatively, run the virtio-win-gt-x64.exe installer found inside the mounted ISO to install all drivers simultaneously. 2. Optimize the Disk Bus Mode For maximum read and write speeds on your QCOW2 disk image: Set the Disk Bus type to instead of SATA or IDE.
