Hello, i'm using libvirt/kvm/qemu on a stable Debian Linux KVM 4.9.0-6-amd64 . qemu-kvm : 1:2.8+dfsg-6+deb9u5 libvirt-daemon : 3.0.0-4+deb9u3 libvirt-clients : 3.0.0-4+deb9u3 virt-manager : 1:1.4.0-5 virt-viewer : 5.0-1 virtinst : 1:1.4.0-5 My guests are made with this kind of command line : virt-install --connect=qemu:///system --name=debian --ram=2048 -- disk  /home/vm/debian.qcow2,size=10,format=qcow2  --network=bridge:bridge-0-1,model=virtio  --network=bridge:bridge-0-2,model=virtio  --network=bridge:bridge-0-3,model=virtio --accelerate -- noautoconsole  --vnc --vnclisten=0.0.0.0 --keymap=fr  --cdrom=/home/iso/debian-6.0.1a-i386-netinst.iso --os-type=linux  --os-variant=debiansqueeze --hvm Since a long time ago now (may be a Debian upgrade) i noticed that ssh  session from my personal PC to guests are very slow (connection and  behaviour) My ssh configuration is the same on all my real/vm servers. The problem occure only on my guest. Have you got a solution or an idea to solve this problem ? Thanks for your help