Sending semi-large (~5MB) JSON payloads over web socket not working

I am trying to send a semi-large JSON payload over a web socket but it doesn't seem to work. The size of the message is about 5MB; it contains some Base64 encoded images. The WebSocket.send(String string) method is not throwing any errors.

Is this a known issue and are there any work arounds? Does it have something to do with the frame size of a websocket message?

@koush