performance: 0.889 device: 0.885 network: 0.845 mistranslation: 0.807 x86: 0.678 vnc: 0.665 user-level: 0.656 graphic: 0.626 risc-v: 0.613 socket: 0.608 permissions: 0.604 register: 0.574 i386: 0.573 architecture: 0.563 semantic: 0.555 ppc: 0.550 virtual: 0.540 hypervisor: 0.452 debug: 0.440 boot: 0.436 VMM: 0.420 PID: 0.415 TCG: 0.364 KVM: 0.358 peripherals: 0.339 files: 0.326 arm: 0.273 kernel: 0.272 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.]