Extreme lag on client when posting

Question

Hello,
I'm trying to create a realtime multiplayer game by using Flash Player 10.1's new P2P capabilities. However, I'm having some problems.
To make it realtime I need to send updates of player positions very often. Right now I do something like this every frame:
var user_info:ByteArray = new ByteArray ();
user_info.writeByte (USER_POSITION); //type
user_info.writeUnsignedInt (player_id); //id
user_info.writeShort (int(player.x)); //x
user_info.writeShort (int(player.y)); //y
user_info.writeUnsignedInt (Connect.getMsgSeq ()); //unique msg id
group.post (user_info);
Now, the problem I'm having is that when I have this code running every frame my application lags a lot, even if no one else is connected to the group. If I simply comment out the line "group.post (user_info);" then the lag disappears (but then it doesn't send anything of course).
Surely there should be a way to send a simple message like that without slowing down my application. Have I missed something?
I'm thankful for any help or insight.

Answer 1

Get rid of ENTER_FRAME! You simply cannot send 30 notifications out in a second continously. Better use a timer (which - in best case - knows about the current latency of the client and adjusts itself) which sends out a status every 10ms. Basically you cannot get under this time in any case and it's much, much, much more performant.
Besides I wouldn't always set up a new ByteArray. Instead try just clearing & re-writing it.