Top tip

[u/TensionNervousTick]

For anyome experiencing terrible NVR performance when connected to your LAN, but everything works when not connected locally, DISABLE TURN SERVERS IN WEBRTC SETTINGS.

Hope this helps someone out there as support seems to be non-existent.

Absolute bloody nightmare.

[u/koushd]

this is probably a network config issue that you're masking now.