Been working for great for years and no changes has been made on lan.
Basically, one of my lan computers (ethernet connected) has suddenly turned notably laggy when controlling the (server) machine. As debug, I connected with another lan computer instead (via wifi) and it worked perfectly (with same quality settings etc).
I highly suspect one of the latest W10 updates (from last month) since laggy machine has them whilst the ok computer doesn't.
Hope for a fix
Could you please submit a ticket? https://support.radmin.com/index.php?/Tickets/Submit/RenderForm/3
We`ll do our best to help you to fix this problem.
It was the strangest thing ever, solved by re plugging the physical network cable.