performance: 0.800
device: 0.800
graphic: 0.712
network: 0.477
files: 0.351
semantic: 0.342
boot: 0.321
PID: 0.314
other: 0.259
permissions: 0.161
debug: 0.150
vnc: 0.128
socket: 0.101
KVM: 0.029

[Feature request] qemu-img option about recompressing