Problems with server

[Chris Penrose]

I'm not sure where else to post this but I'm having a problem having my friends play on my server. With one of them on and me (2 in total) I play fine but he has a some lag that's annoying. Then when we have a third person join the lag makes it impossible for them to play at all. We all checked our internet and that doesn't seem to be the problem. I also have made a tekkit lite server and we were able to play on that with out a problem. Anybody have an idea for the problem or a way I can fix it?

[Feekkee]

They have updated to tekkit 1.0.6? And your server are updated to?

[Calvariae]

Make sure java, both client and server side, is up to date, does more than you may think.

Also I've seen where people were experiencing lag in 1.0.5, but not in 1.0.6. So like Feekkee suggested, update Tekkit too. Again, both client and server.