Why does my Windows system’s Wi-Fi bandwidth decrease when connected to a ScreenBeam receiver?

This article applies to ScreenBeam 1xxx-Series, 960 and 750 products.

When a Windows laptop connects to a ScreenBeam receiver via Miracast peer-to-peer (P2P), overall Wi-Fi throughput on the laptop may be reduced. 

This behavior is expected due to key differences in how our Miracast implementation works compared to Roku’s. ScreenBeam allows users to designate a specific Wi-Fi channel for Miracast, ensuring consistent performance by reserving that channel. In contrast, Roku’s retail Miracast solution dynamically follows the channel of the source device (e.g., a laptop), which can vary and is less predictable.

When a device must operate on two different Wi-Fi channels simultaneously, one for Miracast peer-to-peer (P2P) and another for the infrastructure network, bandwidth on the infrastructure network can drop. This is known as DCM (Different Channel Mode).

While our approach provides more control and stability, retail Miracast solutions may still encounter DCM if the source device is connected to a DFS (Dynamic Frequency Selection) channel, which can trigger similar bandwidth issues.