Browser-GUI disconnects

I am running HA now in a Hyper-V VM (moved there from a Green HA) and after some testing around (running it on different hosts to check for voice-reaction times) I find myself with a very slow frontend, disconnects of Browser-sessions and general poor performance of the front-end. COnnecting to the debug log also takes ages…
Everything is up2date.
Where can I start to troubleshoot? Hyper-V shows no problems…

turns out it was a DNS issue. My fritz box had three different IPs for homeassistant… :frowning: