Hi @carton,
Could you please provide the following information:
-Your client (Android/iOS/Window/Html5)?
-Connection type (Wired or Wifi)?
Could you also try checking the suggestions from the “Performance Tuning” chapter in the user manual?
Link: https://manual.spacedesk.net/PERFORMANCETUNING.html
Bypassing network routers can improve the performance, this can be done by using direct ethernet cable connection (crossover) or using WiFi Direct/Hotspot.