Performance degrades with many internal snapshots.
To make your Windows 10 QCOW2 VM feel like a native machine, consider these tweaks: windows 10qcow2
If your host runs Ubuntu, Fedora, or Debian, KVM/QEMU with QCOW2 outperforms VirtualBox or VMware Workstation. It is kernel-native, resulting in near-bare-metal performance for Windows 10 guests. Performance degrades with many internal snapshots
After running this command, boot into Windows 10, open , and expand the C: partition into the newly created unallocated space. Summary Checklist for a Flawless Windows 10 QCOW2 VM Recommended Setting Disk Format Enables snapshots and dynamic sizing. Disk Bus VirtIO SCSI Maximum I/O throughput. Cache Mode Data safety and raw-like speed. Preallocation Eliminates host file system fragmentation. Storage Driver Fedora VirtIO ( viostor ) Avoids the "No drives found" Windows setup error. After running this command, boot into Windows 10,