What constant data IC2 needs to transmit

I was just about to post about this exact issue. What is going on?

E-net Calculations?

And if you don't what this is, im guessing your main source of power is solar and you have hundreds or thousands of those solar panels to collect power... *sigh*

Why would the server be sending those eNet calculations to client? The only thing the client should need to know is what to display on the GUI when a block is right clicked.

EDIT: Dammit Ninja'd

Then i dunno. (And if you are using v1.08 then no matter if you think its related or not, you post it in the v.1.08 Because you don't really know if its a v1.08 exclusive issue or not)

1.08 thread its a discussion one, not a bug report one dah.

Were all of the machines running? I have noticed on a largely unmodified sever that lag screws up furnaces, implying that some of the furnace code is being run on the client. Even it that is not the case, the sever is most certainly updating the client side progress of the machines.

While a machine's GUI is closed, the server shouldn't be sending anything to the client about the state of processing going on inside, unless external texture changes are needed, say to show a progress bar. If that's the case, the server should only be sending a small update packet when there's been a change, or when a new player comes into range that doesn't have the correct data. There's specific functions built-in to handle this already and they work wonderfully when used right.

Things like sounds playing and such do require a packet to be sent to start or stop them, but if they are going to play on a loop, that should be coded into the client so the server doesn't have to keep sending a "Start/stop" packet.

EnergyNet calculations should not be running at all on the client. There is nothing visible that happens with the EnergyNet.

I really do hope IC2 goes open source at some point in the future because I'm sure the community will be able to help optimize and streamline it with great success while still letting the IC2 creators control the direction of the mod.

I can suggest you to improve hooking and hook packet data, this will allow to actually trace source of packet spam.

and yes, there is nothing special with ic2 that require many update packets.