device: 0.885 network: 0.845 mistranslation: 0.807 vnc: 0.665 other: 0.656 instruction: 0.629 graphic: 0.626 socket: 0.608 semantic: 0.555 boot: 0.436 KVM: 0.358 assembly: 0.161 Sometimes, when not touching the SDL window, the guest freezes I often just run some development guest machine, and leave its SDL window on a workspace I don’t touch, and only interact with it via TCP. And sometimes, the guest just freezes. After it gets the focus back, it comes back to life (starts responding via network). QEMU release version: 2.8.1.1 Which version of SDL are you using? SDL 1.2 or SDL 2.0? If you were using 1.2, could you please try 2.0 instead? Support for SDL 1.2 has been removed now. [Expired for QEMU because there has been no activity for 60 days.]