Yea, we will come up with a solution to handle guest chat soon.
A lot of things mentioned in this thread are either impossible to achieve or irrelevant to the actual problem.
To keep it short; Hardware is out of the question, all lag issues are from: minecraft / bukkit / plugins (And yes, we are always running the latest builds of everything and customize everything we can to make it better.)
The upcoming release of minecraft in the next days should fix (and break) a bunch of stuff, but in overall it will improve the game performance a lot.
A lot of things mentioned in this thread are either impossible to achieve or irrelevant to the actual problem.
To keep it short; Hardware is out of the question, all lag issues are from: minecraft / bukkit / plugins (And yes, we are always running the latest builds of everything and customize everything we can to make it better.)
The upcoming release of minecraft in the next days should fix (and break) a bunch of stuff, but in overall it will improve the game performance a lot.