performance: 0.941
mistranslation: 0.894
x86: 0.874
graphic: 0.795
device: 0.668
semantic: 0.584
architecture: 0.547
ppc: 0.436
files: 0.420
network: 0.415
socket: 0.345
vnc: 0.291
PID: 0.263
kernel: 0.254
peripherals: 0.250
permissions: 0.247
i386: 0.237
arm: 0.228
register: 0.197
debug: 0.188
assembly: 0.173
boot: 0.161
hypervisor: 0.136
user-level: 0.135
virtual: 0.131
VMM: 0.120
TCG: 0.116
risc-v: 0.116
KVM: 0.083

qemu running slow when the window is in background

Reported by <jedinix> on IRC:

QEMU almost freezes when running with `GDK_BACKEND=x11` set and the parameter `gl=on` added to the `-display` option.

GDK_BACKEND=x11 qemu-system-x86_64 -nodefaults -no-user-config -enable-kvm -machine q35 -cpu host -m 4G -display gtk,gl=on -vga std -usb -device usb-kbd -drive file=/tmp/Win10.qcow2,media=disk,format=qcow2 -drive file=~/Downloads/Win10_2004_EnglishInternational_x64.iso,media=cdrom

Leaving out `GDK_BACKEND=x11` or `gl=on` fixes the issue.

I think there is quite a bit of information missing here? Which host OS / distribution are we talking about here? Which parameters were used for "configure"? Which QEMU version has been used? Is it still reproducible with the latest version? ... thus I wonder whether this should get closed, or whether it's worth the effort to move this to the new tracker at Gitlab?

[Expired for QEMU because there has been no activity for 60 days.]