The frame rate isn't likely to be improved at all with the way that the Proximity app works. It essentially takes a still image screen capture, then transmits this to the codec over the network, then repeats the same process over and over again. It's not a true video feed which is why it is slow, and has a delay as the screen is processed at both ends from the stills.
If you need to have a higher frame rate, you will need to either use a different product, or use a wired connection for the content you want to share.
Wayne
Please remember to mark helpful responses and to set your question as answered if appropriate.
