I'm experiencing poor performance/latency with my Microsoft Lumia 950/950XL.

Microsoft Lumia 950/950XL users may experience poor Miracast performance and latency, and/or slow keystroke response with wireless/wired keyboard and operating in Continuum Mode. This issue occurs on ScreenBeam Mini2 and Mini2 Continuum Edition, with firmware versions 5.3.8.0 and earlier. To resolve this issue, please ensure the firmware on your ScreenBeam Mini2 receiver is updated to version (5.3.9.0 or later).

Updating your firmware is easy using the free ScreenBeam Configuration Utility available for Windows 10, Windows 8.1, and Android. For more help, see the FAQ "How Can I Update the Firmware on my ScreenBeam Mini 2?" to get detailed instructions on updating the firmware on your ScreenBeam Mini 2 receiver.