Uninstalled Spacedesk from both Tablet and Laptop (due to other Spacedesk issues), and reinstalled brand new versions today.
Same issues – very laggy on the tablet, verging on unusable.
I’m using the laptop’s hotspot function and the tablet is logged into that wifi signal (so nothing else on that network), the two machines are physically right next to each other (as you’d expect), so don’t expect the signal is ‘weak’.
Spacedesk was a very, very good product, but it seems to be getting slower and less reliable over time. 🙁