Greetings!! Hope you are doing good.
As AppWarp works on real Time principal, we have apply data limit over the message. When the number of players is the room exceeded there is more data to be sent and latency will increases.
Currently there is no way to send data more than data limit in one message by modifying AppConfig.json file.You can divide the message in chunks and sent to the same to the players.
Let me know the what kind of data you need to sent, it is simple text or Json file or other, than I will be happy to suggest more ways to accomplish the same.