A reminder as usual to our SMP players that the new 1.7 server software may not be released for a few days. If you wish to continue playing on our server until then, please either backup your Minecraft folder or hold off updating until our server is compatible.
Thank you.
Edit: In regards to the server lag issue, countless performance tweaks have been made which have reportedly resolved the issue. Please let us know if you’re still experiencing severe lag (excluding during saves, players entering and reboots)
There is a way to upgrade but still play on the server, make another user account on your computer, and upgrade it there, leave the other minecraft on the other account on 1.6.6